So how come there aren't a LOT of sick people?

[Bleach=Chlorine?]

Ever swim in a nasty pond, lake or river? The human body is pretty resiliant.

** Just kidding, although I am sure that is part of the answer. When I first found that chart I was thinking the same thing.

[mas985]

Maybe there are not many sick people but there are sure a lot of sick pools. Look at all the posts about algae and green pools. This is were most of the problems occur because of mismatched CYA and CL.

[CarlD]

Have you seen the way they've been voting lately?

[nicole12]

Before I found this site, I followed that 1-3ppm no matter the CYA, I live in Mass. and in May/June the water was pristine crystal clear because the water temp was in the 60's/70's and then when the water started to warm up in July then the algae started. Water never turned green, just all over the liner, in the filter, even the clear view to see the backwash had green in it. I didn't understand what I was doing wrong. I was using gallon after gallon of Algaecide, still green. Then I found the chart on this site and 3 years later and have never had algae again. I use pucks to chlorinate in a floater, bleach to shock and have switched to Baking Soda and Borax.

[Tredge]

This makes no sense to me......

I thought the reason concluded behind SWG companies all suggesting 80ppm CYA was that you could maintain a lower chlorine level.

Does this chart state that SWG owners need at lease 5ppm Chlorine to have a safe pool? I dont think my SWG will generate that much.

[Rangeball]

My understanding is that it's different for SWG pools, as the cells are basically super chlorinating the water continously (as long as they're running), so less of a residual is needed in the pool.

[CToon]

http://www.ppoa.org/pdfs/PrP_Cyanuri...0or%20Bomb.pdf

it makes for an informative read . And even if I never read anything about CYA, I know whats working in MY pool. Before I found this site , I couldnt figure out why my pool was such a pita. When I learnt to deal with the high cya , the pool looks great , less work and more fun. dont need to prove anything else to me

[mas985]

This makes no sense to me......

I thought the reason concluded behind SWG companies all suggesting 80ppm CYA was that you could maintain a lower chlorine level.

Does this chart state that SWG owners need at lease 5ppm Chlorine to have a safe pool? I dont think my SWG will generate that much.

SWGs are different. See this thread:

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

[cheshamjim]

Have you seen the way they've been voting lately?

I love this observation.