I thought I read somewhere that the Hanna checkers for phosphate don't give correct readings on freshwater. Having said that I can't seem to find the link where I read that, so I'm not 100% sure. I guess it can't hurt to have a new RO membrane regardless..
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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