How much shock for your pool, by size

Granular shock (calcium hypochlorite, "cal-hypo", 65% to 73% available chlorine). Pick your pool size for a full dose table, or use the calculator for any volume.

Pick your pool size

Pool size	Dose
1,000 gallons	2.9 oz at CYA 40
2,000 gallons	5.8 oz at CYA 40
5,000 gallons	14 oz at CYA 40
6,000 gallons	1.1 lb at CYA 40
10,000 gallons	1.8 lb at CYA 40
15,000 gallons	2.7 lb at CYA 40
18,000 gallons	3.2 lb at CYA 40
20,000 gallons	3.6 lb at CYA 40
25,000 gallons	4.5 lb at CYA 40
30,000 gallons	5.4 lb at CYA 40

Any other size

Add

2.1gal

of Liquid chlorine 10%

269 fl oz7.9 L

Raises free chlorine from 2 ppm to the shock level of 16 ppm (40% of CYA 40) in 15,000 gal.

Side effects: Salt +23 ppm.
Pour it slowly in front of a return jet with the pump running.
Hold free chlorine at 16 ppm: retest and top up at least morning, midday and evening.
You are done when combined chlorine is 0.5 ppm or less, the overnight chlorine loss is 1 ppm or less, and the water is clear.
No swimming during the SLAM. Swim when free chlorine is back within your normal range and at or below the re-entry level on your chlorine label (many labels say 4 ppm). Never swim during a SLAM or with free chlorine above 10 ppm. Your product label always comes first.

Check the product label. Strengths vary by brand, so enter the % printed on yours. Add one chemical at a time, into the water, and never mix chemicals.

Save this test and get reminded when it is time to retest.

Pool Calc for iPhoneComing soon to the App Store

How much shock for your pool, by size

Pick your pool size

Any other size

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