---
title: "What Is Copper ionizer? Pool Glossary | Marina Pool Services"
description: "A copper ionizer is a device that adds copper to the water to slow algae, and chlorine is still needed."
url: https://marinapool.multisites.ai/glossary/copper-ionizer
publisher: Marina Pool Services
phone: +1-817-896-1120
quote: https://marinapool.multisites.ai/contact
---

Water chemistry

# Copper ionizer

A copper ionizer is a device that adds copper to the water to slow algae, and chlorine is still needed.

A copper ionizer releases small amounts of copper into the water. Copper helps keep algae down, so the pool needs less chlorine. It does not make a pool chlorine-free.

Copper has a downside. Too much, or low [pH](https://marinapool.multisites.ai/glossary/ph), can cause blue-green or dark [metal stains](https://marinapool.multisites.ai/glossary/metal-stain) on plaster and hair. Keep copper within the maker's range and test for it. You still need [free chlorine](https://marinapool.multisites.ai/glossary/free-chlorine) in the water, as the CDC minimum applies to public pools. Clean the electrodes on schedule.

[Marina can helpPool Maintenance Services](https://marinapool.multisites.ai/our-services/pool-maintenance-services)

## Related terms

-   [Algaecide](https://marinapool.multisites.ai/glossary/algaecide)
-   [Metal stain](https://marinapool.multisites.ai/glossary/metal-stain)
-   [Green algae](https://marinapool.multisites.ai/glossary/green-algae)
-   [Free chlorine](https://marinapool.multisites.ai/glossary/free-chlorine)

## Need a hand with your pool?

Call or text and tell us what your pool needs. Estimates are free for qualifying services, and same-day estimates are possible when the schedule allows.

[Call (817) 896-1120](tel:+1-817-896-1120)[Get a quote](https://marinapool.multisites.ai/contact)

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