Staff Answer
Aug 20, 2026 - 01:14 PM
The CircuPool TOTALBalance pH Control System utilizes a regulator to connect to its CO2 tank(s), and you can chose a regulator with connections for 1, 2, or 3 tanks. When connected, the regulator draws CO2 from all connected tanks simultaneously (there is no mechanism for cycling through each tank individually). Either way, the amount of CO2 storage you choose determines how long before you refill or swap tanks. You want to match the tank capacity to meet or exceed the recommended sizing (copied below) so that you infrequently need to swap tanks.
To balance cost and convenience, CircuPool recommends these sizing guidelines, which should require a CO2 refill no more than once every three months*.
One 20 lb. tanks - 12,000 gallon pool or less
Double 20 lb. tanks / one 35 lb. tank - 20,000 gallon pool or less (35 lb. tank sizes should be purchased or rented locally)
Triple 20 lb. tanks - 36,000 gallon pool or less (Recommended size for most residential pool)
Triple 35 lb. tanks - 64,000 gallon pool or less (35 lb. tank sizes should be purchased or rented locally)
You can alter the CO2 tank sizing according to your needs, so that refills are need from monthly to annually. Visit manufacturer site for more detailed information.
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