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Thread: To slam or drain first? CYA 100

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    To slam or drain first? CYA 100

    Hi all! New pool owner and first time poster here needing some help! So, I think the pool guy who was 'taking care' (ha!) of things before we bought the house really screwed us. As of now here are levels,

    FC 7 ppm (we added a bunch of liquid form, it was previously at 1)
    CC comes up at 0?
    Ph 7.8
    TA 120
    CH 425 (used a Hach test strip for this)
    CYA 90-100


    So, overall our water is pretty clear. But, in between us firing the pool guy and waiting for our test kit and equipment to come in, we got mustard algae. I can add a photo later, but we're pretty sure its algae and not pollen. Its on the sides in the shade, under the ladder steps, around the light and we cant brush any of it off. The pool guy's idea of maintenance was just a big pile of chlorine tabs in the corner of the waterfall, and maybe skimming out leaves every 2-3 weeks. We kept him on for 2 months before we got rid of him. We haven't added any stabilizer in any way, so I can totally blame him for that, right? Lol

    Ok, so my question is, should we even bother trying to slam with the CYA being so high? Or should we drain a % of the water out and then do it? Keeping in mind it would be a challenge to drain a significant amount. Ahhh, help please!

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    Richard320's Avatar
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    Re: To slam or drain first? CYA 100

    Bite the bullet and drain to 50 CYA or less. Yes, it's a PITA, and yes, your water bill will be big, but maintenance is a whole lot easier with reasonable CYA and eradicating algae is going to be really hard unless you deal with it.
    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.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: To slam or drain first? CYA 100

    Ok, you're confirming what I know but don't want to accept. As a follow up, would getting the CYA down to 70 ish be acceptable? Or is 50 what we should really get to? Just trying to see if there is any leeway here.
    ~30,000 gal IG pool, plaster, DE filter, not sure of models, variable speed pump? terrible water quality, drought restrictions

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    Richard320's Avatar
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    Re: To slam or drain first? CYA 100

    Quote Originally Posted by Battaduck View Post
    Ok, you're confirming what I know but don't want to accept. As a follow up, would getting the CYA down to 70 ish be acceptable? Or is 50 what we should really get to? Just trying to see if there is any leeway here.
    Go look at poolmath. Set it up to plaster, TFP, bleach and then go back up and set CYA to 70. See what shock level and mustard shock level are. Remember, you want to keep it a shock level until you pass the 3 tests and lastly take it up to mustard shock level and keep it there for 24 hours. Pool School - Mustard Algae

    The savings in bleach will probably cancel out the cost of the water.

    I'd call the water company and see if they might allow swimming pool refills every so many years at standard rates rather than the higher tiers. Or at least alert them to what you're doing (Tell 'em it's Calcium buildup or pool resurfacing) and maybe they won't send you a threatening letter or come stick a restrictor on your meter.
    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.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: To slam or drain first? CYA 100

    Alright, it's happening today. Hopefully we can get it done without any issues.
    ~30,000 gal IG pool, plaster, DE filter, not sure of models, variable speed pump? terrible water quality, drought restrictions

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    Oly's Avatar
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    Re: To slam or drain first? CYA 100

    So how is it going? Keep us posted Battaduck.
    27,000 gallons of central CA well water housed in a fiberglass coated concrete/plaster pool, dug into the most productive top soil on earth and surrounded by an urban forest.
    Cleaned with a Pentair 48 sq ft DE filter and a Dolphin Discovery (S200) robot. 250 gal Hot Springs Solana RX stand alone spa. Taylor K-2006. My first thread... New Old House, New Old Pool....

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    Re: To slam or drain first? CYA 100

    Draining went without a hitch yesterday. We rented a pump from Home Depot and it took about 5 hours to drain half the pool. We started refilling right after but turned it off when we went to bed and continued it early this morning. Almost done with that, soon I'll test levels and start SLAMing. Will update on how it goes soon. Hopefully can get this done right the first time and not have the mustard algae come back.
    ~30,000 gal IG pool, plaster, DE filter, not sure of models, variable speed pump? terrible water quality, drought restrictions

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    Richard320's Avatar
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    Re: To slam or drain first? CYA 100

    Excellent!

    I suggest you load up on Motrin now and get busy with the brush. It will a) break the protective biofilm off the algae on the walls and b) mix the old and the new water thoroughly. Especially if you own a wall whale brush.
    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.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: To slam or drain first? CYA 100

    Haha, thanks for the tip. I think I'll make my husband do the harder physical labor.

    How soon can I start testing levels? Pool is almost full.
    ~30,000 gal IG pool, plaster, DE filter, not sure of models, variable speed pump? terrible water quality, drought restrictions

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    Richard320's Avatar
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    Re: To slam or drain first? CYA 100

    Quote Originally Posted by Battaduck View Post
    Haha, thanks for the tip. I think I'll make my husband do the harder physical labor.

    How soon can I start testing levels? Pool is almost full.
    Let things mix for half an hour or so with the pump on. And like I said, brushing speeds it along.
    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.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: To slam or drain first? CYA 100

    Quick update, today is 2nd full day of shocking. Was slightly discouraged yesterday, since algae looked the same. But today, some of it is definitely a browner shade of yellow than before. So I'm taking that as a good sign. We've been brushing as much as we can, keeping FC level up and filter is going nonstop. Fingers crossed we win this battle soon!
    ~30,000 gal IG pool, plaster, DE filter, not sure of models, variable speed pump? terrible water quality, drought restrictions

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    Richard320's Avatar
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    Re: To slam or drain first? CYA 100

    Quote Originally Posted by Battaduck View Post
    Quick update, today is 2nd full day of shocking. Was slightly discouraged yesterday, since algae looked the same. But today, some of it is definitely a browner shade of yellow than before. So I'm taking that as a good sign. We've been brushing as much as we can, keeping FC level up and filter is going nonstop. Fingers crossed we win this battle soon!
    Cleaning up a mess always takes longer than making it. It didn't turn into a swamp in just a couple days. so it'll probably take a week or ten days to clear it up. Make sure any organic debris is out, even if it means vacuuming blind.
    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.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: To slam or drain first? CYA 100

    Ok, got it. We're being super patient with it and keeping up shock level. Just wondering if there are any obvious signs that it is working? The water was always clear, its just algae on the walls. Its definitely not as bright yellow as before, but isn't coming off when we brush or anything. Also, every time I test FC and CC, CC has consistently been 0.
    ~30,000 gal IG pool, plaster, DE filter, not sure of models, variable speed pump? terrible water quality, drought restrictions

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    To slam or drain first? CYA 100

    Take a pic of the area every day. You eyes may not be able to see the difference, but comparing the pics day to day should reassure you that your hard work is paying off.

    I assume you retested your CYA after the refill to verify. And then use that new CYA # to set your SLAM level.

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