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Thread: SLAMming in the rain

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    Join Date
    Jun 2013
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    Belgian Beverly Hills, Illinois
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    SLAMming in the rain

    I am currently slamming my pool due to suspected mustard algae (again). A couple of years ago I had mustard algae which brought me to this wonderful site. Now I suspect it again and am using knowledge acquired from this site and learned from that last time what to do.

    Question 1: I started the SLAM process last Friday and I am slamming with my winter cover still on. Has been in the 50's with rain daily or every other day, so I wanted to protect my pool from getting leaves, debris, etc. from windy conditions and not the weather to worry about solar cover yet. Am I making a mistake with the mesh safety winter cover on? Since I am dealing with mustard algae, should the winter cover be thrown into the pool to slam that also? I have been brushing and vacuuming, and my pressure hasn't really gone up, but I've backwashed none the less. Should slamming be done "topless"? I'm talking about the pool here!

    Current FC 30
    CC .5 or less
    CYA 40
    PH 7.2
    water is still cloudy and has been since I started filtering 2 weeks ago.
    16x32 21K vinyl IG, 1HP Hayward Superpump, Hayward S244T sand filter, Ecomatic ESC 36 SWG, TF 100 test kit & I love my Speed Stir, dobberpoolboy manual vacuum

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    Texas Splash's Avatar
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    Re: SLAMming in the rain

    Hello dobber. SLAMming in the rain is no problem. But at the moment your FC looks to be too high. Remember that even with suspected MA, first you do a regular SLAM and pass all 3 criteria. Only then do you raise your FC to MA level - and only for 24 hours. As for your cover(s), a mesh cover won't hurt anything. Definitely don't cover the water with a solid cover. The water needs to breathe and receive sunlight to oxidize the combined chlorine. Also, there's no need to test pH when the FC is over 10. But if you ever do let the FC sink lower, make sure to get a good pH reading. Seeing that the pH is 7.2 now while the FC is so high just has me a little concerned. Other than that, continue to follow the SLAM page carefully and it will work for you. Don't forget to inspect ladders and behind any lights (in the niche) if you have one.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  3. Back To Top    #3

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    Re: SLAMming in the rain

    Thank you for the quick response Splash. I did a regular SLAM with low CYA (0-20) FC in the teens but still cloudy water after a week or so. The PH reading was when I started the SLAM.

    Here are today's current readings compliments of my wonderful TF100 test kit:

    FC 31
    CC .5
    PH 7.8
    TA 100
    CYA 40
    CH 100

    Mesh winter cover still on, pump running 24/7, water still cloudy...any advice most welcome sir!
    16x32 21K vinyl IG, 1HP Hayward Superpump, Hayward S244T sand filter, Ecomatic ESC 36 SWG, TF 100 test kit & I love my Speed Stir, dobberpoolboy manual vacuum

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    Texas Splash's Avatar
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    Re: SLAMming in the rain

    Just for the care of your vinyl, I would let the FC sink naturally on its own to a regular SLAM level for now (16). Once it settles to the FC of 16, perform an overnight test (OCLT) that evening/next morning. Let's see how all 3 criteria compare to passing the SLAM at that time. If you pass the OCLT and have <= .5 CC and only slightly cloudy water, we may look into enhancing your sand filter's capability with just a slight bit of DE added. But that is a final water clarity step only if the other two pass and we see no indication of remaining algae. In the meantime, while waiting for FC to sink back down to 16, continue to backwash as needed and scrub everything you can get to.

    Hope that makes sense. If you have any more questions, just holler.

    Oh, almost forgot .... when was the last time (if ever) you performed a "Deep Clean" of your sand filter?
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  5. Back To Top    #5

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    Re: SLAMming in the rain

    Our pool was installed in the fall of 2006, what is a "deep clean" of a sand filter? Please educate me, oh "wise one"...
    16x32 21K vinyl IG, 1HP Hayward Superpump, Hayward S244T sand filter, Ecomatic ESC 36 SWG, TF 100 test kit & I love my Speed Stir, dobberpoolboy manual vacuum

  6. Back To Top    #6

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    Charleston, SC
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    Re: SLAMming in the rain

    Anyone care for a sing along of Slamming in the Rain with Gene Kelly and dobber?!?!
    5900 G Fiberglass IG pool (circa 1990), SWG Hayward Aqua Rite GoldLine (2013), IntelliFlo Variable Speed Pump (2013), Hayward Pro Sand Filter (circa 1990), Well water (no iron or other metals fortunately), test with Taylor K2006C, Charleston, SC

  7. Back To Top    #7
    Texas Splash's Avatar
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    Re: SLAMming in the rain

    That would be here: Deep Cleaning a Sand Filter. It has surprised many sand filter owners once they uncovered the beasts within the sand that have become impacted over the years. You might be surprised.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

  8. Back To Top    #8

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    Belgian Beverly Hills, Illinois
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    Re: SLAMming in the rain

    A big Texas thank you to Texas Splash for all your advice. My water is now crystal clear thanks to my first deep clean of a sand filter and a little DE cocktail added to the filter. We are off and running to another pool season. Thanks to all who make this site the best.

    My question now is, with a 10 year old system, is it time to consider changing the sand in my filter? Or just turn it into a "hybrid" sand and DE filter?
    16x32 21K vinyl IG, 1HP Hayward Superpump, Hayward S244T sand filter, Ecomatic ESC 36 SWG, TF 100 test kit & I love my Speed Stir, dobberpoolboy manual vacuum

  9. Back To Top    #9
    Texas Splash's Avatar
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    Re: SLAMming in the rain

    Happy to hear your water is TFP clear! As for the sand ... sand doesn't really go bad after all these years unless something is added to it that may coagulate it. The DE won't hurt it. I suspect the filter hardware will fail before the sand will. Enjoy your clear pool!
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
    Vital Links: POOL SCHOOL, RECOMMENDED LEVELS, RECOMMENDED CHEMICALS, Poolmath Calculator, SLAM, Chlorine/CYA CHART.
    If you enjoyed your TFP experience, please consider donating to Support TFP!

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