Bleach Calc will only tell me how much bleach to add to raise my Cl.
I'd like to know how much Cal Hypo to add. I have a bunch of it, it's easier to store than bleach (I don't have the room for a whole summer's worth of bleach). I don't like running to the store all the time for bleach, so Cal Hypo is much more convenient. The stuff I used to use was HTH 68%, but I think a lot of folks bleached their liners with it, so they cut it down to 60% and it also dissolves easier.
I need a converter from 1 lb bags to gallons of bleach. Even better would be a converter that would not only do 60%, but any % available chlorine.
I'm still going to use a mixture of bleach and cal hypo, moving to more bleach if it becomes convenient to hit the stores or if I can clear out a closet. Can't store it in the shed, it gets too hot.
Hah. In the new neato-torpedo test kit which you can get thru this very website, on the inside of the blue box w/the quick CL test and the pH test, there's a chart that shows the various CL percentages and how much it raises your CL count depending on the size of your pool. Very cool. I think the numbers don't match perfectly w/my pool, but it's close enough.
As far as 60% concentration, that's what HTH Shock & Swim is. The product I used to use (and can't seem to get any more, at least locally) was HTH Super Sock-it which was 68%. The Shock & Swim does dissolve a lot easier, but I obviously need more of it.
Also, I don't measure till about 4 hrs after I shock, because that's how long it takes to turn the pool over through the pump. If my CYA is low (which it has been) I'll lose a bunch of it in that time, so it's hard for me to get an accurate read on how much it raises the FC.
You shouldn't need to wait 4 hours, or one turnover, to take a chlorine reading. If you have decent circulation and add the chlorine over a return in the deep end or slowly into the skimmer then the chlorine will diffuse readily throughout the pool within 30 minutes (even 20 minutes will be reasonably accurate if you have a pool drain as well as skimmer). I did an experiment using a pool dye as well as by measuring chlorine and found that this is how long it took. Think of it this way: if you had only a stirrer and didn't run any of the water through the pool filter, it would still get dispersed. It's the water flow within the pool that does most of the mixing and has very little to do with actually forcing one volume full of water through the pump and filter.