Update on the Af Air Scubber Performance: It's been a month now and it's greatly improved my PH. My low is no 8.19 - 8.2 at night, and 8.31 during the day. In addition, media use and been very good. In that period of time slightly more than 1/2 of the media has expired so I'm happy!AF Air Scrubber: My PH varies like most. At night it gets as low as 7.79 and as high of 8.07 during the day. BRS had 20% off on AF stuff so I bought the AF Air Scrubber and hose. I like this Scrubber because the water reservoir is separate from the main reactor and makes top off a breeze. So far it has been running for about 30 hours. My new low at night has been 8.13 and during the day 8.2. It keeps going up. So far so good. Looks like this reactor works well. I bypassed the air can on my Ultrareef Akula Skimmer and hooked the hose directly to the Venturi.