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I've been searching but havent really found anything that addresses my issue specifically. I have a Sta Rite Max-E-Therm 400. The issue...when the heater cycles on there is a loud bang (think explosion loud). The heater then operates as it should and heats the pool/spa. This had happened on...

My situation is a little unique.. In the past I have tried to maintain chlorine levels with tabs and shock - obviously this always ends up with high CYA levels and inevitably algae blooms and such. I just recently had to do a partial drain and refill to get CYA to a manageable level, although...