Water testing and left over trichlo

[Baketown]

Thank you for your response,
Chlorine- too low to register
Ph-7.4
TA-250
CH-400
Cya- too high to give a number! Was only able to add 1.8ml before black for disappeared.

I was just getting ready to put some more of the shock in, but wasn't sure how much to use.

[PoolDoc]

Next time your do your CYA test, mix 1/4 cup pool water with 1/2 cup tap water. Test, and then multiply x3 for your actual CYA level.

Do NOT buy any more stabilized chlorine -- dichlor or trichlor, in any form.

Do go ahead and add more chlorine ASAP -- I can't tell you how much, because I don't have your equipment form yet!

Also read about muriatic acid, and lowering alkalinity . . . because you're gonna need that:

http://pool9.net/ma/
http://pool9.net/alk-step/