Start-ups and Chlorine levels - any good tips?

We have recently completed a start up on a pebble tec pool. We have addded all the ingedients suggested to make a perfect pool - yet our chlorine levels just won't read past a .2 - .3. Our conditioner level is at a 80 ppm. It's puzzling....what is the hold up??? Thanks!!!

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  • Thanks so much!!!!
  • Karen,

    I suggest the use of a product to inhibit scale formation during startup. There are any number of these and most of the time they also control metals so it is a win win. Dose per manufacturers directions. In addition to that we generally add 1 gallon muriatic acid per 5000 gallons of water. Do not start the pump until the pH normalizes near 7. The key to this is repeated brushing to help stir the water and prevent pockets of high pH.

    After the pH is about 7.2 (it will come up naturally) start the pump anc filter for a couple of days. At this point you can add chlorine.

    It sounds like you may have a chlorine demand situation with your pool. You can have that tested. If you want to go without testing you keep adding chlorine until you show a residual.

    I agree with Jeff, no more CYA in the water. I prefer 30-50 ppm.

    Good luck
  • Karen,
    There was a study done by the National Plasterers Pouncil and Arch Chemicalsregarding stabilizer levels, and the fact that CDC recommended level is no higher than 50ppm to be effective. Cyanuric acid (stabilizer, conditioner) is destructive to finishes in higher concentrations, also the problem is that chlorine molecules bond with the stabilizer molecules, if you have too much stabilzer it ties up your chlorine.
    Also new pool start ups run high ph due to the cement used in the finish. keep that ph in the recommended range or you will induce scaling on the finish and run the possibility of voiding warranty.
    Here are two links to information as well.

    http://www.npconline.net/saturation%20index.doc

    http://www.tricitypool.com/tc-plaster_study.html
  • Thank you for the tips!! Much appreciated.
    Cheers
  • Karen,

    I sure wouldn't put your cynaric acid reading any higher than your 80 ppm. Your free available chlorine goes low as your stabilizer has locked the chlorine up with readings close to 100 ppm or above. In fact, I try to keep mine between 50-60 ppm in most of my pools, especially in hotter climates. You can achieve this by backwashing and adding fresh water. Your important reading on any newly plastered pool is the pH. Plasterers would like you to keep it at 5.0, but this level would eat out heaters in a few weeks. I try to keep ours at 6.6-7.0 during the first two weeks of operation. This will require diligence with the muratic acid as the new Pebbel Tec will suck out the acid quickly. Now to why your chlorine level will not get above .2-.3. I only use liquid chlorine when starting up a newly plastered pool. It immediatly goes into solution and is one of the best sainitizers outside of chlorine gas. Add several gallons of liquid and check the reading. Try a new test kit and see if you get different results. As long as your water is clear, I wouldn't get too upset. Good luck.
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