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Unregistered
10-05-2008, 10:34 AM
I am setting up my first ebb and flow using PVC and want to know how often I will need to change my 20 gallon resevoir to replentish the nutrients.

Unregistered
10-12-2008, 02:54 PM
Try the "1/2 method" it works good for me. For example, you have a 10 gallon tank. When topping off with water, keep track. After adding 5 gallons of top-off, change the tank.

Unregistered
10-21-2008, 12:31 PM
Why do you have to change the water? Arent you just flushing your nutrients?

Unregistered
11-15-2008, 09:28 AM
1/2 method is good but personally i do it every 7 days religiously and make sure your water temp stays below 75, i keep mine 67-72.