Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 8 of 8

Thread: Scrub the plaster during a drain/refill?

  1. Back To Top    #1

    Join Date
    Jan 2009
    Location
    Cupertino, CA
    Posts
    1,966

    Scrub the plaster during a drain/refill?

    I'm doing a drain/refill due to excessive CYA (seduced by tabs in a floater... oh well) and CH higher than you'd like. As my wimpy sump pump strains to perform this herculean task (I estimate 4 days to drain 3/4 of the water) I'm noticing that the plaster looks kinda dirty. The water has always been clear (at least as long as I've owned this place, about 4 months). A very brief scrub with a hand brush didn't seem to have any particular effect, although I admit it was kind of a token effort.

    Should I plan to go at the plaster with something while the water level is down?
    Probably not a detergent, but maybe dilute bleach would be okay?
    Or is this more likely to be a scale-type problem?
    Or does plaster always look like this? I have no idea how old the pool is.

    Thanks,
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

  2. Back To Top    #2
    gtm's Avatar
    Join Date
    Aug 2008
    Location
    St. Petersburg, Florida
    Posts
    201

    Re: Scrub the plaster during a drain/refill?

    Before you drain 3/4 of the water in your IG pool, have you checked the water table level? Is "popping out" a worry? Here in FL this could be a disaster waiting to happen. But hopefully the CA ground water level is more lenient ... Gary
    15,000 gal. IG fiberglass pool w/ 1 hp Hayward Max-Flo and 250 lb. Hayward sand filter
    Located in St. Petersburg, Florida, and enclosed in a birdcage

  3. Back To Top    #3

    Join Date
    Jan 2009
    Location
    Cupertino, CA
    Posts
    1,966

    Re: Scrub the plaster during a drain/refill?

    Water table is not an issue in drought-stricken CA.
    In fact I'm doing this now, rather than wait for spring, so I can get the refill done before the water rationing kicks in.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

  4. Back To Top    #4

    Join Date
    Apr 2008
    Location
    Central Texas
    Posts
    326

    Re: Scrub the plaster during a drain/refill?

    I did a total drain a couple of years ago. CYA was so high after we bought the place that it took obscene amounts of chlorine to keep the water from turning green and black algae was trying take over. I used a garden sprayer to spray down the entire surface with a 1:4 bleach/water mix. Then I cleaned it all with a pressure washer (be VERY careful if you use one of these, as they have the ability to really mess up the plaster if you get the tip too close to the plaster!!!). For good measure, I then sprayed it all down with the bleach/water mix again, just be sure everything was DEAD.

    After all that, I filled it back up and used tabs again for one summer. Once I learned about BBB, I added Borax and started adding bleach. Taking care of the pool last summer was a real treat compared to the previous two! 8)
    26,000 Gallon Gunnite IGP
    2 HP Challenger High Head Pump
    60sf Nautilus DE filter
    Polaris 280

  5. Back To Top    #5
    gtm's Avatar
    Join Date
    Aug 2008
    Location
    St. Petersburg, Florida
    Posts
    201

    Re: Scrub the plaster during a drain/refill?

    Quote Originally Posted by PaulR
    Water table is not an issue in drought-stricken CA.
    Sounds good. Not the drought, you know, but that you can drain without worries. I just wanted to make sure that you knew about the popping out danger, but you're clearly on top of things. Based on my experience, getting the CYA down will help a lot. Here in FL, though, I had to drain much more slowly!
    15,000 gal. IG fiberglass pool w/ 1 hp Hayward Max-Flo and 250 lb. Hayward sand filter
    Located in St. Petersburg, Florida, and enclosed in a birdcage

  6. Back To Top    #6

    Join Date
    Mar 2009
    Location
    Charlotte, NC
    Posts
    530

    Re: Scrub the plaster during a drain/refill?

    What is "popping out "?

    Thanks
    19,800 gallons (closed/winter 18,654 gal); plaster; 18x34 Ft kidney bean shape, Depth 3Ft-5Ft. Built 1992
    Pentair Whisper Flow Pump 1HP. Winter safety cover w anchors.
    Sand filter, Pentair Sand Dollar Top Mount Model SD80; Effective Filtration Area 3.5SF
    - FlowRate 75GPM, 8Hr 36,000, 10Hr 45,000, 12Hr 54,000; Pressure Weight 50PSI
    BBB (Hayward Chlorinator when leave town). Polaris 360 cleaner.

  7. Back To Top    #7

    Join Date
    Jan 2009
    Location
    Cupertino, CA
    Posts
    1,966

    Re: Scrub the plaster during a drain/refill?

    If you have an in-ground pool, and the water table (i.e. how far down you dig before reaching water) is higher than the bottom of your pool, then when you drain the pool you are turning it into a boat. It can "float" on the groundwater -- popping out of the ground. Some main drains have a relief valve that will let groundwater in if you drain too far, to keep this from happening.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

  8. Back To Top    #8
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Scrub the plaster during a drain/refill?

    To get back to the stains on the plaster: In addition to thinking about how much they bother you, and how much work you are willing to do to remove them, you could experiment to find what will take them off. Organic staining will generally come off with very gentle rubbing with a wet trichlor tablet. Calcium scaling will require acid. Some things will come off with some gentle brushing. Metal stains often respond to holding a wet Vitamin C tablet against the stain for 30 seconds.

    If they are calcium scaling, you will need to do an acid wash to remove them. Doing this now will save some effort, since the pool needs to be drained to do an acid wash, but it is still a large project. Metals and organic stains are best treated while the pool is full.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •