Where is my chlorine going?

[vanman2501]

My numbers are good, my pool is crystal clear but my chlorine is 0. I shock it at night and the chlorine reading is high and by morning the chlorine is back to 0. This has been going on since I opened the pool over month ago. I tried shocking a few time a day for a few weeks then finally gave up and for the past three weeks have just kept chlorine tablets in my floater and the pool is still the same. Good numbers except the chlorine and crystal clear. Where is my chlorine going?

vanman2501

[Watermom]

We'll need a little more info to be able to help. Post current water testing results (FC, CC, TC, PH, alk, Calcium hardness, cya) and what type of kit you tested with. Also, tell what type and volume your pool is and exactly what all you have added to your pool. (Ingredients, not just "shock", etc.) Then somebody here can take a look and hopefully help you figure out what is going on.

[vanman2501]

My numbers are
TH - 20
FC - 0
PH - 7.5
TA - 120
CYA - 45
I have used a few different testing kits the HTH test kit, the HTH test strips and another liquid test kit the I can't remember the name of. All have the same readings
I have a 24' round 52" deep above ground pool.
I use borax, baking soda, liquid bleach and chlorine tablet.
Since I changed to using these products I have never had a problem until this year.

vanman2501

[Watermom]

In a pool this size, each quart of 6% bleach should raise your cl by about 1 ppm. How much bleach at a time are you adding and how often? Go ahead and add 6 quarts (1.5 gallons) and that should take you up to 6ppm. What type of chlorine tablets are you using?

[vanman2501]

I use pro-care 3" pucks
I was adding one and a half gallons then went to 2 gallons and then went up to 3 gallons and I'm back to one and a half gallons. No matter how much I added I always end up at zero in the morning. I just added one and a half gallons so I see what happens in the morning again.

vanman2501

[tonyl]

You might have your water tested for phosphates. If they are 3000ppm+ as I suspect, it will consume the chlorine quite rapidly. I've been there and have to treat every 3 years or so. Not many people have this problem, but phosphates build up in my pool and I find it impossible to keep chlorine in the water more than a few hours when I let them go. Sounds like that's what you have going on to me.....I use ALUM when it gets that high, kinda messy...have to vacuum to waste after treating but it's effective.

Hope this helps, Tony