---
title: "What Is Sodium bisulfate? Pool Glossary | Marina Pool Services"
description: "Sodium bisulfate is a dry 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/sodium-bisulfate
publisher: Marina Pool Services
phone: +1-817-896-1120
quote: https://marinapool.multisites.ai/contact
---

Water chemistry

# Sodium bisulfate

Sodium bisulfate is a dry acid used to lower pH and total alkalinity.

Sodium bisulfate is a granular option that many owners find safer to store and carry than liquid acid. It still burns skin and eyes, so wear gloves and eye protection and follow the label.

It works like [muriatic acid](https://marinapool.multisites.ai/glossary/muriatic-acid) but is milder. It lowers [pH](https://marinapool.multisites.ai/glossary/ph) and [alkalinity](https://marinapool.multisites.ai/glossary/total-alkalinity), and it can add sulfates over time. Add it in small doses with the pump on, then retest after a few hours before adding more. Keep it dry and away from chlorine products. Dust and fumes irritate the lungs, so do not pour it indoors.

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

## Related terms

-   [Muriatic acid](https://marinapool.multisites.ai/glossary/muriatic-acid)
-   [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)

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