My fill water has has a very high Ph and TA (8+/250+) so combined with a SWG, I am constantly adding acid to keep things in balance. I see there are a number of cheap Ph meters/controllers on eBay, marketed for the aquarium market. Would these reliably report Ph from pool water, with all the other chemicals we have in the water? I am envisioning connecting the relay output to a small pump that would introduce diluted MA to the pool water.
http://cgi.ebay.com/Milwaukee-Automated ... 2a0709fb5f
http://cgi.ebay.com/Weipro-Realtime-PH- ... 3a5e77f329