Pool water sample vial, test strip and color chart on a pool deck
Pool & Spa · Topic

Water chemistry

Target levels for chlorine, pH, alkalinity, calcium and stabilizer, how much shock to add, and how salt pools compare with chlorine pools.

  • 3 guides
  • 2 tools
  • Reviewed Oct 3, 2026
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Water chemistry guides

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Photo of a backyard in-ground pool with cloudy, bright green algae water that needs a SLAM-level shock
Pool & Spa How-to Calculator

How Much Shock to Add to a Pool: Doses, SLAM and CYA

One label shock dose adds about 5–10 ppm free chlorine. Label doses for liquid chlorine, cal-hypo, dichlor and non-chlorine shock, SLAM levels by stabilizer, and the CYA that weekly dichlor adds by city.

12 min · Updated Oct 7
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