In some areas you can find it being sold as a deicer. It is also used to increase the speed at which concrete sets up in cold weather. And if all else fails, pool stores sell it.
If you have the CYA level set to 70 ppm in The Pool Calculator, then it says the "Normal" range is 5-10 ppm FC. Note that the calculator uses the "Now" CYA value rather than the "Target". The Chlorine / CYA Chart also gives the minimum of 5 ppm FC. So I don't know where you got 4 ppm.HowardL said:I just used the default calculator TFP target of 4ppm. Are you saying that I should aim for higher FC?
The recommended levels you stated above are for plaster with bleach and, yes, they are the recommended levels for your pool; however, since your CYA is 70 (above recommended levels, but still controllable) you must adjust/increase your FC levels accordingly.HowardL said:OK. I know I'm making progress, but I also know that I am now getting confused about target levels. I have noted NOT to use the defaults in the Pool Calculator. But how about these defaults?
pool-school/recommended_levels
FC 3ppm - 7ppm
pH 7.5 - 7.8
TA 70 - 90+
CG 250 - 350
CYS 30 - 50
Are these good values for me to use, or are there other recommended levels? Sorry to be dense about this, but I am starting to feel more comfortable with the testing, so making sure that I am evaluating the tests properly sounds like a good idea to me. Thanks.
Howard
HowardL said:OK. Found out that I can order it with free shipping to be delivered to my local Ace Hardware store. Howard
CYA high to start with and sure to go up due to the use of tablets, combined with FC too low; a perfect recipe for getting algae,ThePoolNinja said:CYA level at 70 is just right.
And i would keep your Free Chlorine level at 3.0 all the time.
Don't be scared to use 3'' Tablets, just keep an eye on your chemicals.