Cant hold chlorine

[herrmanncr]

Got my K2006 last night. Did some testing. Gonna take some getting used to. Added bleach to get back to 20 and Borax to raise PH. Tested this morning 330 am and results are.
FC - 13.5
TC - 14.5
CC - 1
ALK - 160-170
PH - 7.4
CH - 400
CYA - not sure if i did it right(transfer to comparator until black dot disappears). Shows over 100 but pool store yesterday said 65?


So if I'm right I need 6.5 ppm to get back to 20 becuase I'm still losing chlorine right?
If 1gal bleach adds 3ppm then I need to add just over 2gal which I did. How am I doing? This is a pain!!! Thanks

[CarlD]

Actually, your numbers sound right to me. 2 gallons of 6% should get you to 20ppm. But if you have CYA=100, you may consider that the shock level for CYA 100 to 200 is 25ppm. You are still getting a CC reading greater than zero which means you are still fighting something.

I would add 3 gallons then, to put you at around 23ppm, and see if it holds. Plus, you will need to maintain FC between 8 and 15 as long as your CYA is so high.

P.O.P.P: The most important ingredient--Pool Owner Patience and Persistence!

Yes, it's frustrating but high CYA forces one to commit to much higher FC levels than we normally think about.

You may want to consider dumping half your water and refilling to reduce your CYA level to 40 to 50--easier to maintain lower chlorine levels then.

[herrmanncr]

I'm trying not to drain just yet because the different readings between my test and pool store (65vs100) but I will try and raise the FC with more bleach and see what happens. Unfortunately my wife doesn't know how to use the kit yet so I will get her to take a sample to the pool store and get tested this morning and have her add bleach accordingly. Can she use the pool today with such high FC?

[CarlD]

It's not the high FC that concerns me--it's that you still have a non-zero CC (actually, if CC is .5 or less you are pretty much OK).

If the test shows CC is OK (less than .5), it's up to you whether she can swim or not. I tend to think not because I'm conservative, because you haven't yet been able to hold a consistent FC--and with that high CYA level, I would wait until FC holds steady for at least 1/3 of the day. Still, it's your choice. But warn her to use an older suit because the high FC could fade it.

Ultimately, the decision and responsibility are yours. We can only suggest.

BTW, I find that I always run my CYA test the same way: Hold the tube at waist level and face the sun. I move it around a little as I add the fluid, making the dot more visible, so if the dot peeks through I add more. Still, I believe your readings taken immediately from the water with the K2006 before I believe someone in a pool store, probably using strips.

[herrmanncr]

Wife took sample to pool store cause I can't be there to test. Here are results:
FC - 10
TC - 10
CC - 0
CH - 268
PH - 7.3
ALK - 113
CYA - 65
SAT Index - .10

They want to swim so I said add 1gal, wait 1hr and swim. I'll test and treat when I get home.

[aylad]

Those numbers look fine to me--I would swim in it with no problem. Great job!

Janet

[herrmanncr]

All you guys. Will test when I get home and adjust as needed and post #'s. Thanks!

[herrmanncr]

Just wanted to pass on an update. Everything appears to be holding pretty good. Tested throughout the weekend and bleached as needed to maintain. Tested this evening and #s are:
FC - 6.5
TC - 7
CC - .5
PH - 7.2
ALK - 105
CH - 290
CYA - didn't test/out of reagent/this test is diffacult to read/still above 60

Not sure on maintenece dose yet. FC this morning at 4am was 10 and added 1 gal bleach.
Did not add all day and this evening it was 6.5 so added about 1/2 gal. Pool in full sun from 10 to 6/7. Any advise? Thanks everybody for your help. This site is a life saver!!!

[aylad]

Glad it's all working out for you. It will probably take a couple of weeks of testing and making additions until you work out the addition amount that's right for your pool. Sounds like you're already pretty close!

Janet