i have a 55 gallon res on my 6 pot system, but i only keep abour 30 gal in there no use to waste that much water. but my system is expandable to 48 pots thats why the res is so big. but anyways i change my res like once every 10 days. i like to keep fresh nutes in there for my girls, especially during flowering. dont want any algae or mold building up either. i give my res a good cleaning each time. Better to spend a few more bucks on more nutes than not supplying my girls with the best.

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