Nitrate Removal Systems

Nitrate Removal Systems NZ

GoodsDirect2U supplies JAJ Water Treatment nitrate removal systems for New Zealand bore water, rural water supplies, lifestyle blocks, farms and household water filtration setups. These systems are designed to help reduce nitrate levels in water using strong base anion exchange resin.

Nitrate can be a concern in private water supplies, especially bore water and rural groundwater. The correct treatment setup depends on the nitrate level, water source, household water use, flow rate and any other water quality issues such as sediment, taste, odour, bacteria, hardness, iron or manganese.

Why Nitrate in Drinking Water Can Be a Concern

High nitrate levels in drinking water can be a health concern, especially for bottle-fed infants. In the body, nitrate can be converted to nitrite, which can affect the ability of blood to carry oxygen. This condition is called methaemoglobinaemia and is often known as blue baby syndrome.

This is why nitrate testing is important for private water supplies, rural water supplies and bore water, especially if the water may be used for drinking, cooking or making infant formula. If nitrate levels are high and the water may be used for babies or infant formula, seek advice from your local public health unit or an appropriate health professional.

A nitrate removal system can help reduce nitrate levels, but it should be chosen based on a water test result and installed as part of a suitable treatment setup. Testing the treated water after installation is also recommended to confirm the system is reducing nitrate as expected.

Nitrate, NO3 and NO3-N Explained

Water test results may show nitrate as nitrate, NO3, or nitrate-nitrogen, NO3-N. These are different ways of reporting the same nitrate issue, not different contaminants. A nitrate removal system is used to help reduce nitrate, but the number on the water test needs to be read correctly because NO3 and NO3-N use different measurement scales.

Some reports show nitrate as nitrate or NO3. Other reports show it as nitrate-nitrogen or NO3-N. A nitrate removal system is still targeting nitrate, whether your water test result is shown as NO3 or NO3-N.

As a rough guide, NO3-N × 4.43 = NO3, and NO3 ÷ 4.43 = NO3-N.

Water Test Result	Equivalent Reading
11.3mg/L as NO3-N	About 50mg/L as NO3
5mg/L as NO3-N	About 22mg/L as NO3
50mg/L as NO3	About 11.3mg/L as NO3-N
25mg/L as NO3	About 5.6mg/L as NO3-N

When choosing a nitrate removal system, check which measurement your water test uses. This helps avoid comparing the wrong numbers when checking nitrate levels or treatment requirements.

Test Your Water Before Choosing a Nitrate Removal System

Before buying a nitrate removal system, it is important to test your water. A water test helps confirm whether nitrate is present, how high the level is and whether the result is reported as nitrate, NO3, or nitrate-nitrogen, NO3-N.

A nitrate removal system targets nitrate either way. The reason the reporting method matters is because NO3 and NO3-N use different number scales. For example, 50mg/L as NO3 is approximately the same nitrate level as 11.3mg/L as NO3-N.

We also recommend testing the treated water after installation to confirm the system is reducing nitrate as expected. Nitrate levels, water use and resin performance can change over time, so follow-up testing is important, especially for private bore and rural supplies.

How Nitrate Removal Systems Work

JAJ nitrate removal systems use strong base anion exchange resin to help reduce nitrate in water. This type of resin is designed to attract and hold negatively charged ions, also called anions, from the water as it passes through the media bed.

Nitrate is a negatively charged ion. Inside the nitrate removal system, the resin has positively charged exchange sites that hold exchangeable ions, commonly chloride ions after regeneration with salt. As water passes through the resin, nitrate ions in the water are attracted to the resin and are exchanged for chloride ions.

In simple terms, the resin swaps nitrate from the water for chloride held on the resin. This helps reduce nitrate levels in the treated water. Because the process relies on contact with the resin, the system needs to be correctly sized for the nitrate level, flow rate and household water use.

Over time, the resin becomes loaded with nitrate and other competing anions from the water. When this happens, the resin needs to be regenerated. During regeneration, a salt brine solution passes through the resin. The high chloride level in the brine helps push the captured nitrate off the resin and recharge the resin with chloride ions again.

The nitrate and regeneration wastewater are then flushed to drain. This is why automatic nitrate removal systems need salt added. The salt is not working like a normal filter cartridge; it is used to regenerate the strong base anion exchange resin so the system can continue reducing nitrate over time.

Other Contaminants Strong Base Anion Exchange May Help Reduce

Strong base anion exchange resin is mainly used on this page for nitrate reduction, but this type of treatment may also help reduce certain other negatively charged contaminants, depending on the resin type, water chemistry, flow rate, contact time and system setup.

Depending on the resin and setup, strong base anion exchange may help reduce some forms of selenium, chlorate and perchlorate. These should not be assumed to be treated unless they are included in the water test and the system is confirmed as suitable for those contaminants.

Silica needs extra care because not all silica behaves the same way. Reactive or ionic silica may be reduced by strong base anion exchange in suitable treatment setups, but colloidal silica is different and may not be effectively reduced by a standard nitrate removal system. If silica is a concern, the water should be tested and the correct treatment method confirmed before relying on the system for silica reduction.

A nitrate removal system should not be treated as a general “removes everything” water filter. It is specifically used where nitrate reduction is required and may also reduce some other anions depending on the water chemistry and system design.

How This Differs From Sediment, Carbon and UV Filtration

Strong base anion exchange is different from standard sediment filtration, carbon filtration and UV treatment. A sediment filter helps reduce dirt, sand, silt and particles. A carbon filter helps improve taste, odour and chlorine taste. A UV steriliser helps with microorganisms.

A nitrate removal system is specifically used where nitrate reduction is required. It does not replace sediment filtration, carbon filtration, UV treatment or other water treatment systems that may be needed for different water quality issues.

Whole House Nitrate Removal vs Nitrate Filter Cartridges

A whole house nitrate removal system is generally the better option where nitrate reduction is required for household water supply. These systems are designed for automatic operation and resin regeneration through a salt backwash process.

Nitrate replacement filter cartridges are another option for suitable filter housings and lower-flow applications. These cartridges use nitrate removal media and need to be replaced regularly depending on water usage, nitrate level and flow rate.

If you are unsure whether you need a whole house nitrate removal system or a nitrate replacement filter cartridge, start with a water test and consider your flow rate, number of outlets, household size and how much treated water is required.

Reverse Osmosis as a Drinking Water Option

A reverse osmosis system may also help reduce nitrate in drinking water. Reverse osmosis systems use a membrane to reduce many dissolved contaminants from water, including nitrate, depending on the system, water pressure, membrane condition and water quality.

Reverse osmosis is usually best suited as a point-of-use drinking water system, such as a dedicated tap at the kitchen sink. It is commonly used for drinking water, cooking water and water used for making drinks.

For most homes, a standard under-sink reverse osmosis system is not normally used as a whole house nitrate removal system because the flow rate is much lower than a whole house water treatment unit. Whole house water use can include showers, washing machines, toilets, outdoor taps and multiple outlets running at once, which usually requires much higher flow than a kitchen drinking water RO system can supply.

As a simple guide, a nitrate removal system is usually the better option where nitrate reduction is required for a whole household water supply. A reverse osmosis system may be suitable where nitrate reduction is mainly required for drinking and cooking water from one tap.

Recommended Filter Setup

For best results, a nitrate removal system should usually be installed as part of a suitable filtration setup. A sediment filter is recommended before the nitrate removal system to help reduce sand, silt, dirt and particles before they reach the resin.

A carbon filter, such as a CTO carbon block filter, can be installed after the nitrate removal system to help improve taste and odour. Carbon filtration does not replace nitrate treatment, but it can help improve the overall drinking water taste.

If the water supply may contain bacteria or microorganisms, a UV steriliser may also be required. Nitrate removal does not replace UV treatment. UV treatment is used for extra protection against microorganisms and should be matched to the water quality, flow rate and filtration setup.

Flow Rate and System Sizing

Flow rate is important when choosing a nitrate removal system. If water flows through nitrate media too quickly, it may reduce contact time and affect treatment performance. The right system should be matched to your household water demand and water test result.

For household use, consider how many outlets may be used at the same time, such as showers, taps, washing machines and outdoor taps. For rural or farm use, consider whether the system is supplying a house, troughs, sheds, staff facilities or other water points.

If you are unsure how much flow your household needs, read our Water Pump Flow Rate & Head Guide. While that guide is written for pumps, the flow rate information can also help when thinking about whole house water treatment sizing.

Maintenance and Salt Backwash

Automatic nitrate removal systems require maintenance. The resin is regenerated through a salt backwash process, so salt needs to be checked and topped up when required. If the system has a low salt alarm reminder, refill the salt when the alarm indicates it is needed.

Pre-filters and carbon filters also need to be replaced or serviced as required. Dirty sediment filters can reduce flow and pressure, while old carbon filters may stop improving taste and odour properly.

Maintenance timing depends on water usage, nitrate level, sediment load, filter size and water quality. If you notice a pressure drop, taste change or unexpected water test result, check the filters, salt level and system settings.

Nitrate Removal for Bore Water and Rural Supplies

Nitrate removal systems are commonly considered for bore water, rural groundwater, lifestyle blocks and private water supplies.

A bore water system may need more than nitrate treatment. Depending on the water test results, you may also need sediment filtration, carbon filtration, UV treatment, iron and manganese treatment, hardness treatment or other water treatment equipment.

If babies or bottle-fed infants may be drinking the water, it is especially important to get water tested and seek appropriate advice if nitrate levels are high.

Choosing the Right Nitrate Removal System

Before choosing a nitrate removal system, check your water test result, nitrate level, household flow rate, pipe size, number of outlets, water source and any other water quality issues.

Also consider where the system will be installed, whether the system needs power, where backwash water will discharge, how salt will be topped up and whether pre-filtration or post-filtration is required.

If you are unsure which nitrate removal system is right for your water supply, contact GoodsDirect2U with your water test result, water source, household size, approximate flow rate and any current filtration equipment.

Nitrate Removal System FAQs

What does a nitrate removal system do?

A nitrate removal system helps reduce nitrate levels in water. JAJ nitrate removal systems use strong base anion exchange resin to help reduce nitrates from the water supply.

Why is nitrate in drinking water a concern?

High nitrate levels can be a concern because nitrate can be converted to nitrite in the body, which can affect how blood carries oxygen. Bottle-fed infants are the most vulnerable group, and this condition is often called blue baby syndrome.

How does strong base anion exchange remove nitrate?

Strong base anion exchange resin has positively charged sites that attract negatively charged ions such as nitrate. As water passes through the resin, nitrate ions are held by the resin and exchanged for chloride ions. This helps reduce nitrate levels in the treated water.

Why does a nitrate removal system need salt?

Salt is used to make brine for regeneration. During regeneration, the high chloride level in the brine helps push captured nitrate off the resin and recharge the resin so it can continue reducing nitrate over time.

Will a nitrate removal system reduce both NO3 and NO3-N?

Yes. NO3 and NO3-N are different ways of reporting the same nitrate issue, not different contaminants. A nitrate removal system targets nitrate either way. The water test number must still be read correctly because NO3 and NO3-N use different measurement scales.

Do I need a different filter for NO3 compared with NO3-N?

No. You do not need a different filter just because the water test reports nitrate as NO3 or NO3-N. The treatment is still for nitrate reduction. The difference is how the nitrate level is measured and displayed on the test report.

What is the difference between NO3 and NO3-N?

NO3 means nitrate expressed as the full nitrate molecule. NO3-N means nitrate-nitrogen, which measures only the nitrogen part of the nitrate molecule. They are different ways of reporting the same nitrate issue, so it is important to know which one your test result uses.

What is the nitrate limit for drinking water in New Zealand?

New Zealand Drinking Water Standards list the maximum acceptable value for nitrate as 50mg/L when expressed as NO3, or 11.3mg/L when expressed as NO3-N. These are two ways of expressing the same nitrate limit.

Can a nitrate removal system reduce selenium, chlorate or perchlorate?

Strong base anion exchange resin may help reduce some other negatively charged contaminants, including certain forms of selenium, chlorate and perchlorate, depending on the resin type, water chemistry, flow rate and system setup. If these contaminants are a concern, they should be included in the water test and the system should be confirmed as suitable before relying on it for treatment.

Can a nitrate removal system reduce silica?

Strong base anion exchange may help reduce reactive or ionic silica in suitable treatment setups, but not all silica is the same. Colloidal silica may not be effectively reduced by a standard nitrate removal system. If silica is a concern, the water should be tested and the correct treatment method confirmed.

Can reverse osmosis reduce nitrate?

Yes, reverse osmosis may help reduce nitrate in drinking water, depending on the system, membrane condition, water pressure and water quality. It is commonly used as a point-of-use drinking water system, such as an under-sink system with a dedicated kitchen tap.

Can I use reverse osmosis for whole house nitrate removal?

For most homes, a standard under-sink reverse osmosis system is not suitable for whole house nitrate removal because the flow rate is designed for drinking and cooking water from one tap, not showers, washing machines, toilets and multiple outlets. For whole house nitrate reduction, a nitrate removal system is usually the better option.

Should I choose nitrate removal or reverse osmosis?

Choose a nitrate removal system when nitrate reduction is required for the household water supply. Choose reverse osmosis when you mainly want treated drinking and cooking water from one tap, such as a kitchen sink. A water test should be used to confirm the nitrate level and the right treatment setup.

Does a nitrate removal system remove every contaminant?

No. A nitrate removal system is mainly used where nitrate reduction is required. It may also reduce some other negatively charged ions depending on the resin and water chemistry, but it does not replace sediment filtration, carbon filtration, UV treatment or other water treatment systems.

Does a nitrate removal system make water safe to drink?

A nitrate removal system can help reduce nitrate levels, but drinking water safety depends on the full water test result and the complete treatment setup. Nitrate treatment does not remove all possible contaminants. Test the water before and after treatment and get advice if you are unsure.

Does nitrate removal also remove bacteria?

No. Nitrate removal is not the same as UV treatment or disinfection. If bacteria or microorganisms are a concern, a suitable UV steriliser or other treatment may be required as part of the system.

Does nitrate removal remove sediment?

No. A nitrate removal system is not a sediment filter. A sediment filter is recommended before the nitrate removal system to help reduce sand, silt, dirt and particles before the water reaches the nitrate resin.

Should I install a carbon filter after a nitrate removal system?

A carbon filter is often recommended after a nitrate removal system to help improve taste and odour. Carbon filtration does not replace nitrate treatment, but it can improve the overall drinking water taste.

How does a whole house nitrate removal system regenerate?

The automatic nitrate removal system regenerates the resin through a salt brine backwash process. Salt needs to be added when required, and systems with a low salt alarm can help remind you when salt needs topping up.

How often do nitrate filters need replacing?

Replacement timing depends on the filter type, nitrate level, water usage and flow rate. Nitrate replacement cartridges may need replacing more often than a whole house automatic resin system. Follow the product instructions and confirm performance with water testing.

Can nitrate be removed with a normal carbon filter?

No. Standard carbon filters are generally used for taste, odour and chlorine reduction. Nitrate reduction requires suitable nitrate removal media, such as strong base anion exchange resin, reverse osmosis or another treatment method designed for nitrate reduction.

Is nitrate removal suitable for bore water?

Yes, nitrate removal systems are commonly used for suitable bore water and rural groundwater supplies where testing shows nitrate reduction is required. Bore water may also need other treatment depending on the full water test result.

What should I do if nitrate levels are high and I have a baby?

If nitrate levels are high and the water may be used for babies or infant formula, seek advice from your local public health unit or an appropriate health professional. Do not rely on guesswork when babies or vulnerable people may be drinking the water.

Can GoodsDirect2U help choose a nitrate removal system?

Yes. Contact GoodsDirect2U with your water test result, water source, household size, flow requirement and any existing filtration setup. This will help us recommend a suitable nitrate removal option.