Jim~ let me make sure I understand. You pump out 5g from the sump then you add 5g back to the tank or the sump? After the 5g you add back you pump out another 5g?
I have a 32 gallon brute container filled with saltwater. My litermeter system pumps water out of my system 12 times a day to a drain and replaces it with equal amounts of fresh saltwater. No buckets, no fuss. About every 10 days I make up a fresh batch of saltwater.
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