Salt Generator CYA recomendations

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farsonic

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Jul 5, 2014
58
Queensland, Australia
My Halochlor recommends a CYA level of 20ppm, which includes integrated ORP and PH sensors...with an initial starting point of 700 for the ORP. They are targeting a FC level of between 1 and 3ppm using this approach. Troublefree pool recommends around 50ppm for CYA, obviously with a correspondingly higher FC level as well.

So, whats the latest suggestion with this type of combination? My pool suffers historically from poor circulation with a couple of dead spots so I've tended to run CYA around 50ppm and FC around 6 which has worked pretty well. (Although I've just completed a successful SLAM for the last week with a good OCLT due to some algae)

Happy to stick with the TFP suggestions if this isn't going to mess up the ORP/PH readings etc and still look to do regular tests using my Taylor 2006.

F
 
Are you running a Halochlor or the CrystalClear from your signature?

CyA interferes with ORP control. Actually, everything interferes with ORP control, adding acid, bicarb, a large dose of rain water etc will change the set point and require intervention. I do not believe ORP is well suited to the domestic back yard pool. They are better suited to the commercial sector where operators are testing and monitoring multiple times a day. But all the big manufacturers have one and none of them are willing to discontinue them and possibly loose market share.

It’s really down to ORP or CyA where I choose CyA any day of the week. But I knew that when I was looking for a new SWG. With a K2006 ORP control is obsolete, you can manage your FC much better with the FAS/DPD test and simple timer control. I believe you can turn it off.

Around 50ppm CyA is a bit vague. TFP recommends a ratio of FC to CyA due to the chemical interaction between them both. See the FC/CYA Levels chart and pic below.

And FWIW the industry standard of 1-3ppm should not apply when using CyA. The AU standard for domestic pool water quality says that FC should be maintained at a minimum of 2-3ppm when CyA is used. No maximum is given. The industry should be manufacturing equipment and supplying guidelines that meet the AU standard.

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Sorry about that, they’ve updated it on me but the numbers are the same. I’ve always run at 7/70 in summer and 5/50 through winter. I have no sun on my pool through winter and the slightly lower CyA helps a little bit with my CSI. I do notice a difference when topping up my CyA in that I need to turn my SWG down a bit or run a little hotter. :)
 
You can give that a try but you’ll need to run with a low CyA level to get a stable ORP value, it would be a more direct control method just to adjust the chlorinator run time or output according to your FC test result. Changing the ORP set point according to the FC test results would work if the FC was the only parameter changing the ORP value but it’s not. Rain, acid, bicarb, CyA, tap water will all influence the ORP value. Some will have a dramatic affect while others will cause a slow steady change that goes unnoticed at first. All of that means a lot of testing and adjusting. And with a low CyA you’ll be loosing a lot of FC to UV destruction.
 
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