Swapping to BBB but what about CalHypo

[chem geek]

As a rule of thumb, for every 10 ppm of FC added by trichlor you are also adding 9 ppm of CYA and with dichlor every 10 ppm FC added adds 6 ppm CYA

This is a typo and is reversed. For every 10 ppm FC added by Trichlor it increases CYA by 6 ppm. For every 10 ppm FC added by Dichlor it increases CYA by 9 ppm. Between Trichlor and Dichlor, it is the latter that raises CYA more quickly.

[RobDHW]

Thanks all. I'm good to go. 3/4 box of Borax added and just a bit of baking soda and my pH is 7.2 my TA is 100. I've also added CA and will check it later. (I also get the adding CYA thing via pucks - they're trichlor, but right now I've got plenty).

Right now my boys & the neighbor kids are going to use up all the FC, so I need to run & lifeguard.

Rob

[Watermom]

Richard --- When I read that initially, that was my first thought that dichlor added more cya. I was going to look it up this evening. Thanks for clarifying. I think Evan's fingers were going too fast when he wrote that. I do that all the time and have to go back and retype. Sometimes I can't even type my name. You don't know how often I'll type Lias, Lia, etc. and have to go back and spell it right -- Lisa!

[CarlD]

Richard --- When I read that initially, that was my first thought that dichlor added more cya. I was going to look it up this evening. Thanks for clarifying. I think Evan's fingers were going too fast when he wrote that. I do that all the time and have to go back and retype. Sometimes I can't even type my name. You don't know how often I'll type Lias, Lia, etc. and have to go back and spell it right -- Lisa!

I NEVER do that.

See you later!
Calr

[waterbear]

This is a typo and is reversed. For every 10 ppm FC added by Trichlor it increases CYA by 6 ppm. For every 10 ppm FC added by Dichlor it increases CYA by 9 ppm. Between Trichlor and Dichlor, it is the latter that raises CYA more quickly.

whoops! that's what I get by answering posts at 4:30 in the morning!