4 Steps to Avoid Rust Stains When Shocking a Pool With Well Water

Add a metal sequestrant first Pour in a sequestrant (chelating agent) like Metal Magic or Pool Mate Metal Control before any chlorine. This prevents iron in well water from oxidizing and turning into rusty brown stains.

Run the pump for 24 hours Let the sequestrant circulate fully. Then test and adjust pH and alkalinity to normal levels before moving on.

Balance calcium hardness, then shock Only after the sequestrant has done its job should you balance calcium hardness and finally add shock. This sequence prevents stains from forming.

Retreat every time you add fresh well water Keep extra sequestrant on hand. Each time you top off the pool with well water, you need to treat it again to avoid new stains.