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Thread: Is my outside pool an inside pool?

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    Kes's Avatar
    Join Date
    Apr 2010
    Worcester UK

    Is my outside pool an inside pool?


    I am fortunate enough to have - since mid 2009 - an Abrisud low-profile cover on my pool. We've had the pool for many years in its open state. The cover is a low arc made of an aluminium frame with double-walled polycarbonate sheets. It keeps the dirt out, locks children out, keeps the wind off and heats the water (but is a bu**er to vacuum). It is on permanently, being hinged up on the few very sunny days, and taken off for one day a year to clean. Oh yes, we get into the pool via a sliding hatch which is left open when we swim.

    Right. Should I be managing the pool as an indoor pool? In other words with low cya. The FC doesn't seem to drop much at all, but there again we don't have much sun in the UK. At the moment the cya is up around 80 with FC at 5: I'm reducing the cya gradually by backwashing and moving away from trichlor tabs to bleach (and starting a proper test/recording regime). Is the only difference likely to be the cya/FC relationship?

    I guess the answer is to test and record and see what happens, but I wondered if there were any other covered outside pool users with experience. Thanks.
    11,000 Imp galls inground hopper 15' x 35', Delifol liner (vinyl), sand filter, Abrisud Classic cover, Palintest 315C test kit

  2. Back To Top    #2

    Join Date
    Mar 2010
    Western North Carolina

    Re: Is my outside pool an inside pool?

    I havent any idea regarding your question, but I did just watch the video of the motorized cover on the aquaflex website. That is cool.
    16'x34' IG Vinyl. 1.5HP Hayward 2spd. Hayward S244T sand. Nitro wall climber.

  3. Back To Top    #3

    Join Date
    Mar 2007
    San Rafael, CA USA

    Re: Is my outside pool an inside pool?

    I have a mostly opaque electric safety cover on my pool so the pool is only exposed to sunlight when it is open for about an hour every weekday and longer on weekends. I used to keep around 30 ppm CYA in it and now have around 45 ppm. If your chlorine loss is low, then yes, you can keep a lower CYA, probably around 30 ppm should be fine. I wouldn't go any lower than 20 ppm CYA which is the lowest you can read on the extended CYA test (such as found in the TF-100 -- not sure what you are using).

    With 30 ppm CYA, you can have your minimum FC at 2 ppm so add chlorine to get it to 3-4 ppm and then have it drop no lower than 2 ppm. That seems quite reasonable. If for some reason you find that you have trouble keeping Combined Chlorine (CC) low, then you can go for 4 ppm FC with 20 ppm CYA which will give you more oxidiation power to help oxidize bather waste somewhat faster. That would be what could be done in an indoor pool. For you, having decent air circulation will help, at least when the pool is open.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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