---
title: "What Is Phosphates? Pool Glossary | Marina Pool Services"
description: "Phosphates are a nutrient that can feed algae growth in pool water. Plain-English pool glossary from Marina Pool Services in Grapevine, TX."
url: https://marinapool.multisites.ai/glossary/phosphates
publisher: Marina Pool Services
phone: +1-817-896-1120
quote: https://marinapool.multisites.ai/contact
---

Water chemistry

# Phosphates

Phosphates are a nutrient that can feed algae growth in pool water.

Phosphates come in with fill water, fertilizer, leaves, and rain. Algae uses them as food. High levels do not cause algae alone, but they make it easier for algae to take hold when chlorine dips.

If algae keeps coming back even with steady chlorine, a phosphate test is a fair next step. A remover product can lower the level, but it works best alongside good [chlorine](https://marinapool.multisites.ai/glossary/free-chlorine) and filtration. Keep lawn fertilizer and grass clippings out of the pool. Do not expect a remover to fix a pool with poor circulation or a worn filter.

[Marina can helpAlgae Treatment](https://marinapool.multisites.ai/algae-treatment-grapevine-tx)

## Related terms

-   [Green algae](https://marinapool.multisites.ai/glossary/green-algae)
-   [Algaecide](https://marinapool.multisites.ai/glossary/algaecide)
-   [Fill water](https://marinapool.multisites.ai/glossary/fill-water)
-   [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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