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Thread: Testing questions

  1. Back To Top    #1

    Join Date
    Jul 2015
    Location
    griffin, ga
    Posts
    29

    Testing questions

    Ok, so I have been reading on the forum for several months now, and have been following the program in my own pool for the last month now.

    My first question is what is the down side of keeping my FC in the 5-16 range all the time, if my CYA is at 40? Does it hurt anything to keep it up near or slightly over slam levels over night if it is dropping so much in the day?

    I do seem to use about 121oz of 8.25 % ea. day with temps in the upper 90's. The pool is in full sun from about 9am till 7pm. Water temperature is hitting 92-95 by evening.

    Todays loss was only 3ppm because of cooler night temps and cloudy daytime.

    I know someone is going to ask for an OCLT, but the last week we seem to get some amount of rain most every evening. So, that would throw off the test if I had time to do it at 4:30 am b4 work. So no I haven't done that yet. To do to do........

    Second question is if I'm doing a FC test every day and I'm shooting for 8-16 range, can I use 5ml in the test and still have an accurate test result? It should be one drop for each ppm.
    24ft Round AGP, built 5/10/15, 13500gal, 1hp Hayward pump, sand filter, hard piped, Pulsar Pulsatron Auto clorine pump. Intex auto cleaner robot. TF-100 XL with speed stir.

  2. Back To Top    #2
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Testing questions

    The downside of running higher FC than you need is that you lose more to the sun. FC loss is not a fixed parts per million per day. It's a percentage. So if you lose 4 ppm when you start at 8, you'll lose 8 ppm when you start at 16. That's just wasted bleach -- money just burned up by the sun.

    You should just target enough to keep you above minimum for your CYA until the next time you test and add.

    Also, if you've been getting enough rain to overflow or need a pumpout, you're losing CYA. Low CYA will accelerate the losses to the sun.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
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  3. Back To Top    #3

    Join Date
    Jul 2015
    Location
    griffin, ga
    Posts
    29

    Re: Testing questions

    I did see a drop in CYA about 2 weeks ago, down to a little above 30 but I put some of my leftover pucks into a floater while we were gone for a long weekend to do a two for one. Kept up the FC and brought back up the CYA at the same time. I even thought about adding a few more to raise it to 50 to see how that effected daytime losses.

    Most of the rain we have gotten in the last week or so was just enough to keep it topped off, just enough that I think it would screw up an over night loss count.
    24ft Round AGP, built 5/10/15, 13500gal, 1hp Hayward pump, sand filter, hard piped, Pulsar Pulsatron Auto clorine pump. Intex auto cleaner robot. TF-100 XL with speed stir.

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