- Mar 8, 2010
- Reaction score
Yep I ordered a new RO membrane yesterday. If I do a 15 gallon water change on my 180 gallons of water ( 150 tank, 40 sump with skimmer , 75 gallon refugium) of water it's less of a change than your 7 gallon change on your 75 tank. So , not sure about that thought process.