They exist, but as you noticed are a little pricey. Not to mention if you have one and it fails and brings the pH too low, it could seriously damage your pool. There are some other options; watermom has written up a detailed post on some ways to minimize pH rise in swcg pools: http://www.poolforum.com/pf2/showthr...-in-SWCG-pools
Item #6 had a big impact for me, and the instructions for how to do it safely can be found here: http://www.poolforum.com/pf2/showthr...stant-to-Algae
In my case I found I can go about twice as long between doses of muriatic with the borax; although I have to add twice as much when I do. Since it inhibits algae growth you may be able to get away with slightly lower output on your swcg as well (which will in turn reduce aeration that causes pH rise).
One more thing not mentioned in watermom's post. If you have any water features such as a waterfall, or even have the return eyes pointed so they are rifling the surface of the water - those will cause the pH to rise faster. Turn the eyes downward, and turn the water features off - both will help you.
I asked about one of the systems you reference just over a year ago. Check out the responses about the systems for more details: http://www.poolforum.com/pf2/showthr...e-amp-Dispense
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