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I used to have a problem with depressed PH. I could not get it above 7.8. I'm using an auto topoff system with ro/di water. I was using a ph buffer. That's when I started having ph problems. I think the buffer was driving up the alkalinity which in turn was supressing the ph. Now, after I make...

If you look at http://www.com, they have Salifert Mg test kits.

I would get the same style fan that runs on 110v and forget about the power supply. The power supply is just another thing that will take up space.

I have one of their units, 2 175 MH's and 2 110 VHO's. I got it about 15 months ago and have never had a problem with it. And, if you have any technical questions, they'll answer them quickly.