Quote:
Originally Posted by abcha0s
However, the purpose of my post was to share my experience with salinity probes. They are increadibly sensative to stray voltages and tend to wander all over the place. Curt at Apex recommends that the salinity probe be placed in a drip cup to completely issolate it from the sytem. I was never able to get a consistant reading from my probe and basically threw it out.
IMHO - I wouldn't trust a sensor to control/maintain the salinity in my tank. I think that you will be constantly adjusting minor fluctations in salinity either up or down. If your not careful, you may get a bouncing effect.
I also woudn't trust a cheap dosing pump. Thus, I'm prepared to spend the money for a high quality balanced pump setup.
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Grumble, grumble -- Ok, I have to admit, you are right on this -- a lot of the idea of using the controller really depends on getting a probe that accurately measures things. The delay in measurements is not a big deal as you could just have delays put into the pump cycle -- pump for a minute or 2 -- wait 10 -- check ph, repeat.
But I could see most of these probes being affected by stray voltage, calibration drift, and general crappiness that would cause the system to mess up the tank parameters big time.
Has anyone done the math on how much the salinity would be affected over time by not using "matched" pumps? If oyu have 200 gal tank, doing 2 gal a day water change, and the pumps are out by a bit --- how much would things get out of whack over the whole ~200 gal water change?