My water was not up to 70 when I did my CYA test. Does temperature affect that reading? It was probably more like 60.With less than 20 CYA, use the 10 ppm SLAM level now and start dissolving 10 ppm of CYA via the sock method. Then use FC of 12ppm for SLAM. All SLAM level FC are based on non-SWCG levels.
Was your water sample warmed to 70 degrees or above before you did your CYA test?
Thanks for answering my question about what level FC I should aim for for my SLAM with low salt levels.On the bottom of each page, there is a link to the old web-based Pool Math page. The app is more up to date.
The shock level FC is a function of the CYA, regardless if you have a SWG or not. So, with the low CYA, yes, target 10ppm of FC. Although you should also bump to the CYA up to 30ppm or so to help protect the FC from the sun while in the SLAM.