best guess question

[dansdad]

Carl my readings are
cl 0
ph 7.0
alk 6
cya black dot never covered

I put 2 levels of powder then 4 then 6 finally 7 and it became a mild pink
took one drop to go clean

pool is still clear weather is still cool

[CarlD]

OK. That helps:
When you ran the chlorine test, you were running the FC test. Did you then, using the same water, run the CC test? You then add (I believe) reagent #3, and if IT turns pink,you follow the same process to determine CC. FC+CC= TC--Total Chlorine. You have 0-.5ppm of FC.

pH is a tad low, but OK for a concrete pool, closed.

Alk = 6 makes no sense. You should not be able to get a reading below 10.

CYA: You have none.

Since you are in winter mode, you want to get your FC to 10 as the shock level. You can use just bleach to do this. 1 gallon of 6% bleach should add 4.6ppm of FC, 1 gallon of 8.25% will add about 6.3ppm of FC. Adjust accordingly.

Since your pH is low, I would not use Tri-Chlor tablets to chlorinate unless you first raise pH with Borax.

[dansdad]

ok Carl I will adjust and get back

[CarlD]

Good luck with it!