---
title: "What Is Muriatic acid? Pool Glossary | Marina Pool Services"
description: "Muriatic acid is a strong acid used to lower pH and total alkalinity. Plain-English pool glossary from Marina Pool Services in Grapevine, TX."
url: https://marinapool.multisites.ai/glossary/muriatic-acid
publisher: Marina Pool Services
phone: +1-817-896-1120
quote: https://marinapool.multisites.ai/contact
---

Water chemistry

# Muriatic acid

Muriatic acid is a strong acid used to lower pH and total alkalinity.

Muriatic acid is common in pool care, and it is dangerous if mishandled. Fumes burn the nose and lungs, and the liquid burns skin and eyes. It can also damage metal and stone.

Follow the label every time. Wear gloves and eye protection, work outdoors, and always add acid to water, never water to acid. Pour slowly in front of a return jet with the pump on, and keep it away from chlorine products. Never mix them. Store it in a cool, sealed spot out of reach of children. Retest [pH](https://marinapool.multisites.ai/glossary/ph) and [alkalinity](https://marinapool.multisites.ai/glossary/total-alkalinity) after an hour. A pro can do this for you.

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

## Related terms

-   [Sodium bisulfate](https://marinapool.multisites.ai/glossary/sodium-bisulfate)
-   [pH](https://marinapool.multisites.ai/glossary/ph)
-   [Total alkalinity](https://marinapool.multisites.ai/glossary/total-alkalinity)
-   [Soda ash](https://marinapool.multisites.ai/glossary/soda-ash)

## 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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