I try to do 30% every other day, on about 1500 gallons of tanks.
Because my system is semi-automatic, sending old water to the garden or lawn (except in winter), and all my tanks are on 3 sumps, in 3 bank systems of tanks, takes about 10 minutes per bank.
Because my system is semi-automatic, sending old water to the garden or lawn (except in winter), and all my tanks are on 3 sumps, in 3 bank systems of tanks, takes about 10 minutes per bank.