Agreed 100%. Mine is a 180gpd spectrapure and it's two 90gpd. I have a booster to keep it right at 80psi and manually adjust the waste water to achieve 2:1. I've run 18,000 gallons through these membranes and rejection is still 99.9%.Where have you guys seen a standard size membrane rated above 100gpd at 50-60psi? To achieve 150 and 200gph every consumer system uses either TWO 75 or 100gpd membranes. It's a Melev reefs system which should be no different. Something is out of wack if ANY single membrane unit is producing that fast at 50psi that is concerningly fast even with a booster pump.
Something is way off here... I'm wondering if chlorine damaged the membrane at some point so it's allowing more water through??