ya thats pretty much what I do, mix 20 gal in a container next to the tank, then useing a spare pump I pump 20 gal out of the sump into an identical container then switch the pump to the new water and refill the sump. what I want to do is make a 50 gal rundown set up so I just pump the bad water outside to my hearts content, then rundown new water to the system. no buckets inside this way
Steve
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