You should always clean your reservoir throughly every two weeks,in case you have bacteria breeding in there.:jointsmile:
Greenthing Reviewed by Greenthing on . to change or not to change...my reservoir Hello and welcome back. I've been dying to ask this question and finally here is my chance! i want to get some opinions about whether or not i should change my reservoir every week to 2 weeks as many people prescribe, topping off with water, or whether i can get away with topping off with nutes, and not worrying about changing the res. i have quite a few tubs running, and changing the reservoirs is heavy duty labour, and i would MUCH prefer to just top off with full strength nutes and change Rating: 5