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What is it?[edit]

A resin is a material, either artificial or natural that has the ability to absorb one or more chemicals from water. It may do this via ion-exchange or via adsorption.

They are typically sold in shops as a powder or pellet. You place the material in a media bag or pouch and water is passed through it.

Can I recharge it?[edit]

Most resins can be recharged once they've absorbed all the chemical they were made for. This of course depends on the supplied instructions but typically water with a high level of sodium chloride is slowly passed through it for an hour or two and the waste salty water contains the chemical. This can not be done indefinitely, typically 5-10 times as other trace chemicals are usually absorbed that are not removed by the salt and so the resin needs to be thrown out.

What chemicals do they remove?[edit]

Typically phosphate, ammonia, nitrate, nitrite or silicate depending on the product.

How much do I use?[edit]

This varies with the product, follow instructions from the manufacturer.

Typical products[edit]

There are a great many resin products available to the customer. Here are a few examples: