I have a 33 gallon full of mixed salt water under my 135. I have a line drawn on the tank to show the 15 gallon mark. This lasts me two weeks.
I drain 15 gallons out once a week via a long hose directed towards the toilet and a jabo pump that will pump the 15 gallons back into the tank when it is drained. I now have a method of adding salt to the 33 gallon which makes mixing easy.
My water changes take 20 minutes max....on my salt tank anyway. My fresh I use a 2000gph sump pump to drain them.
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