About ClearWaterCalc

ClearWaterCalc exists because most pool and hot tub calculators online are either confusing, built to sell a specific brand of chemicals, or both. We wanted something that just does the math — clearly, for free, without pushing a product.

Brand-neutral, on purpose

We don't sell pool or spa chemicals, and we never will. You tell us what product you have and its concentration; we tell you how much to use. That's the whole relationship.

How the site is built

Every formula is written and tested against the published chemistry behind pool and spa water balance — see how our calculators work for the specifics. The free calculators are supported by a small amount of advertising; a paid Pro plan (in development, see /pro) will fund ongoing development without relying on ads alone.

Questions or corrections?

If something looks off, we want to know — reach us through the contact page.