CYA / Pool Pilot Question

[mas985]

Richard,

This has been debated many times before on poolforum and I believe that there is a difference between a SWG and manual chlorination which Ben's table was targeting. Here is one of the more recent debates if you are interested:

http://www.poolforum.com/pf2/showthread.php?t=3185

Many SWG users operate 60-80 ppm of CYA and 2-3 ppm of chlorine, including myself, and do not have a cloudy pool or algae that many others who post on this forum do. So although there is some speculation on exactly what is going on in the cell, besides the generation of chlorine gas, the manufacture's recommended CYA and CL levels seem to do the trick.

One more thing, from the analysis you did in the China Shop, you showed that you only need 2 ppm CL for a CYA of 70 ppm to kill bacteria, assuming 0.01 ppm HOCL. Also, given that it takes awhile to produce algae, a slow kill in a SWG, even over several days, may be sufficient to keep the water clear. This may help explain the difference between SWGs and manual chlorination.