You just don't want the gas to build up too much in the chamber. The gas is released as often as you think it's needed - really depends on where the recirculating pump is. The important item I've learned and read here on RC is to reduce the output of the effulent to one drop per second, until it reads 0ppm of No3. After that, increase the drip rate to two drops until you read 0, then 3 drops, ..... once you get to 5+ you won't have to degas the unit. Good luck.
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