Chlorine by Pool Size

Pick the closest volume for a size-specific chlorine and shock guide with a live calculator.

1,000 gallons

A small spa, stock tank, or plunge pool.

1,500 gallons

A large hot tub / swim spa or a compact plunge pool.

2,000 gallons

A small above-ground round pool (about 12 ft round, 4 ft deep).

3,000 gallons

A 15 ft round above-ground pool at ~4 ft depth.

5,000 gallons

An 18 ft round or small 12x24 ft above-ground pool.

8,000 gallons

A 24 ft round above-ground pool or a small in-ground.

10,000 gallons

A typical 16x32 ft in-ground pool at average depth — the industry reference size.

12,000 gallons

A 16x32 ft in-ground pool with a deeper end.

15,000 gallons

An 18x36 ft in-ground pool at average depth.

18,000 gallons

A larger 18x36 ft in-ground pool with a deep end.

20,000 gallons

A 20x40 ft in-ground pool at average depth.

24,000 gallons

A large 20x40 ft in-ground pool with a deep end.

30,000 gallons

An oversized residential in-ground pool (roughly 20x44 ft, deep).

Not sure of your volume? Use the pool volume calculator first, or the full chlorine & shock calculator.