Pool Chemicals – How Much of What?

The guidelines set by The Association of Pool & Spa Professionals are widely used, but to be certain, you should also check the health codes of the jurisdiction where you live. The chemicals a pool needs to maintain the required standards differ from pool to pool—and day to day. Keeping records to “get to know” a pool can help you interpret its characteristics and perform the correct task.

The Association of Pool & Spa Professionals

Suggested Chemical Standards for Swimming Pools

Free Chlorine, ppm 2.0 – 4.0
Combined chlorine, ppm None
pH 7.2 – 7.8 (ideal range of 7.4 – 7.6)
Total alkalinity, ppm

  • For liquid chlorine, cal hypo, lithium hypo
  • For gas chlorine, dichlor, trichlor and bromine compounds
80 – 100

100 – 120

Total dissolved solids, ppm Not to exceed 1500 greater than at pool start-up
Calcium Hardness, ppm 200 – 400
Cyanuric acid, ppm 30 – 50

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