About Add to My Pool

What it works out

The all-in-one calculator takes all your readings and lists the steps in order. The single calculators each do one job: pool volume, lower pH, raise pH, lower alkalinity, raise alkalinity, chlorine and tablets, shock, stabilizer, calcium and salt.

Every amount comes from published charts: US state, county and city health departments and CDC's model code first. Where sources differ we use the smaller amount, even when that is a maker's or retailer's figure, and label it "Other source": we start low on purpose. Every page that uses a figure lists it under "The charts behind this page", with the source's own words. How the doses are worked out explains the choices we made.

Who it's for

Owners of home swimming pools in the US. Hot tubs aren't covered yet, and public or commercial pools follow their own state and local rules, so the calculators send those to a pool professional.

How it's paid for

For now nothing pays for it: the site carries no advertising and sells nothing. If advertising or affiliate links come later, they'll be labeled and won't change any amount.