CYA for Salt Chlorinator Pools...

Last week I raised my CYA from 30 to about 55. After a week of running with the higher CYA, I have come to the conclusion that it had no affect on my residual chlorine level. During this week I did not change my pump run time or the chlorinator setting. Also, pool temp and PH where about the same.

CL = 2 ppm @ CYA 30 ppm
CL = 2 ppm @ CYA 55 ppm

So the graphs from the CYA study are correct in that chlorine retention does not increase significantly for CYA levels more than 25 ppm even for a SWG pool.

One other question. Assuming the same residual, is a SWG any different than an ORP controller with liquid chlorine? Both would need to add chlorine to the pool at the same rate for the same residual. To me at least, once you get past the chlorine injection method, there is no difference. Therefore, why should the CYA levels be any different? Also, the argument about shocking in the cell for SWGs also applies to the liquid chlorine. The chlorine concentrations would be just as high near the injection point.

Sorry for keeping the debate going but there seems to be a lot of conflicting information, theories and experimental results.

Hi All;

This thread had become both extremely long, and overwhelmingly complex. Consequently, I moved the *full* version to the China Shop. Contrary to what some seem to think, this does NOT mean I disapprove of the thread; rather I just think the thread is too long and too complex to be helpful to newbies.

The full thread is here, CYA for Salt Chlorinator Pools II .

Please continue the debate there. This especially means you, Waterbear, Waste and Chem Geek! ;)

I'm going to summarize some of the less controversial bits below.

Ben
"PoolDoc"

Well, I would've summarized the bits below, but the power went off, and my UPS ran out before I could save the work I'd done. Guess I need to replace the battery.

It's back on, now (finally). But, I gotta go.

Maybe tonight.

Ben

Looking forward to the summary....lot's of good info got exchanged in this thread and once it is sorted out should be very useful!;)