CYA at 0

[EJ797]

I just tested my CYA and it tested at zero. The test was not cloudy at all. I've searched the posts on this site and have seen the threads about the anaerobic bacteria that converts CYA to ammonia.

I broke a line a few months back and had muddy water pumping into the pool for a couple of minutes so it is quite possible the bacteria was introduced to my pool.

I last tested the CYA in April and it was at 42. haven 't tested since.

The only thing that puzzles me is that my pump has been running 12 hours a day for the whole time. So it is not like many of the posts I see where thus bacteria shows up after the pool has been closed for the winter.

I am going to the pool store to have the double check my test before I do anything...

 

[Bama Rambler]

Which CYA reagent do you have?

In all the instances I can remember, we have had one instance where a perfectly clear pool had the CYA convert, so it's very rare to have it happen, but it can happen. It's a good idea to have it verified in this case, but I wouldn't put much faith in the actual number. In fact, I'd probably take it to a couple of stores just to be sure.

 

[Butterfly]

Post your test results for us. We'd like to see it:

FC
CC
pH
TA
CH
CYA - zero

 

[EJ797]

FC 17.5
CC 0
TA 110
CH 250
CYA 0

Did not test PH as the Chlorine was so high. The FC level had dropped to 0 so I was going to SLAM the pool. I Added chlorine last night which is why FC is so high but forgot about the CYA test until this morning.

I use the TF-100

 

[Butterfly]

If you haven't tested since April, having gone all summer, the CYA could be below 20 and would not register on the test.

I suggest you add about 30 CYA via sock method and complete the SLAM process.

 

[spidey07]

A leak could cause this as well as the CYA would go with the water and over that long of a period (haven't tested since April) you could have very low CYA. I'd suggest a bucket test to make sure.