Bleach vs Cal Hypo.

[aylad]

Chemgeek,

My understanding of his post is that "last night" he added the cal-hypo. At 9:00 the next morning he had 2 ppm Cl, and at 2:00 that afternoon was down to zero. I would think if bleaching was the problem, he also would have shown zero when he tested at 9:00 am.

Maybe I read it wrong....

Janet

[Spensar]

Houston,

In most cases bleach is less expensive. If cal-hypo is cheaper than that is fine, as long as you don't have calcium issues. You also don't have a bunch of bottles to recycle either. In my area, the bleach is a bit cheaper than that and the cal-hypo more expensive.

[houston]

Thank you all very much for great response. Finally my pool is back to normal after adding about 3 gallons of bleach every night and running pumps close to overnight.

One question remains: will Cal-Hypo add to TA or CH or both ? as to bleach, it only increases PH.

[chem geek]

Technically, both bleach and Cal-Hypo raise the TA when they raise the pH, but they do so in a way that the consumption of chlorine returns the pH and TA back to where it started.

However, bleach does not increase CH whereas Cal-Hypo does. Cal-Hypo increases CH by 0.7 ppm for every 1 ppm in FC that it provides.

Richard

[houston]

Now I got the whole formula now

baking Soda : increase TA + PH
Muriatic Acid: decrease PH
Borax: increase PH
3" tablet: increase Clorine + CYA
flush/refill: decrease CYA or CH or anything too high
(special procedure): decrease TA
Cal+Hypo: increase CH

Increase PH: Borax,
Increasse PH + CH: Cal+Hypo
Decreate PH: Muriatic Acid
Increase CYA: 3" tablet
decrease CYA: flush/refill
Increase TA: baking soda + mutiatic acid
Decrease TA: special procedure


Do I miss any ?

[aylad]

Don't need muriatic acid when increasing TA..just use baking soda. Your pH MAY rise but it will only be a very small amount....mine never does when adding baking soda. If you want to raise TA and pH at the same time, use soda ash, or Borax brand washing soda.

Janet