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Thread: Completed my first SLAM - I think!

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    FloridaPoolGal's Avatar
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    Jan 2016
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    Completed my first SLAM - I think!

    Pool numbers at pre-SLAM, Thursday afternoon (5-12-2016)
    FC: 7.0
    CC: 0.5 or less
    pH: 7.4
    TA: 90
    CH: 280
    Temp: 76 degrees

    Thursday afternoon I decided to clean my filter cartridge because I noticed the pressure was up. It was completely green! Luckily, it easily washed off. I was surprised to see so much algae. We removed the light Monday so I guess there could have been some algae in the space but none was visually evident. I don't think that amount of algae could have grown in 4 days so it must have been there already. I haven't cleaned the filter since I bought it (60 days ago) because the pressure wasn't rising. My pool water was clear but on some days when I brushed I saw 'stuff' kicked up off the floor of the pool (especially if I had not brushed for 2 days). I chalked it up to dirt and pollen being washed from the screen enclosure into the pool from the rain and settling on the floor. I didn't see algae on the walls or on the floor of the pool. Because I'm paranoid about an algae attack, I check overnight consumption of FC once or twice a week and I had not seen any overnight consumption.

    Obviously, given the condition of my filter (wish I had taken a picture, bright green covering all the folds of my relatively new cartridge) it was time to start a SLAM. I immediately added enough chlorine to raise my FC to 18 and then figured out a couple of hours later I was supposed to be at 24 (my CYA is 60). I also switched the pump to perpetual and brushed the entire pool. After purchasing my TF-100 kit a few months back, I purchased 16 oz of reagent (R-0871) and 4 oz of powder (R-0870) from Amazon because I was constantly testing the chlorine level as I got comfortable with the TFP method. As I started the SLAM, I had everything I needed to test, test, test!

    Friday morning (6 am) I measured FC at 20.5 so it looked like 3-4 ppm had been consumed overnight. I brushed the pool and cleaned the filter again. There was a moderate green cast to the white cartridge which I hosed off. Over the day, I added chlorine multiple times and brushed the pool again. I cleaned the filter again in the evening. There was a very light green cast to some areas of the cartridge that easily hosed off. Ran the pump all night.

    This morning (Saturday) I checked FC and none had been consumed overnight and CC was .5 or less and the water is really clear and sparkling. I cleaned the filter again and there was the faintest green in a couple areas of the cartridge.

    So I guess I'm done?

    After a day of hot FL sunshine (moderated by our screen enclosure, tighter weave on roof), the FC is still 22.5. It's going to take a week to get FC back to 7 or so!

    Should I add acid even though I can't measure pH? My pH usually increases .1 to .2 per day.

    In the pictures, you can easily see the drain that is 8' deep.

    Approx. 20k gal, kidney-shaped, inground, concrete pool built in 1974. 33' long. 18', 14', & 15' across. 3' to 8' deep. Hayward cartridge filter (c1200e). 1 hp, single speed motor replaced 12/2015. In-line Pentair 320 Chlorine/Bromine feeder (do not use). Screened.

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    Richard320's Avatar
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    Re: Completed my first SLAM - I think!

    Congratulations

    If you've been charting your acid consumption, and you feel comfortable with it, you can adjust it blindly. I wouldn't bother. It's so easy to correct once the FC drops that you're not gaining much advantage timewise and your CH isn't so high that scale is threatening.
    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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    FloridaPoolGal's Avatar
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    Re: Completed my first SLAM - I think!

    I'll be checking my filter more often regardless of the pressure. I probably caught things right before they got ugly!
    Approx. 20k gal, kidney-shaped, inground, concrete pool built in 1974. 33' long. 18', 14', & 15' across. 3' to 8' deep. Hayward cartridge filter (c1200e). 1 hp, single speed motor replaced 12/2015. In-line Pentair 320 Chlorine/Bromine feeder (do not use). Screened.

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    Mod Squad pooldv's Avatar
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    Re: Completed my first SLAM - I think!

    Nice work! Pool looks great!
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    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

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    FloridaPoolGal's Avatar
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    Re: Completed my first SLAM - I think!

    I just finished brushing the pool and there was no change in clarity from brushing. I also cleaned the filter again checking for any hint of green on the white cartridge and there was none. FC=16.5 so it is dropping nicely. Actually, I am a little surprised at how quickly it is falling but I'm glad because I want to go swimming!

    Before the slam I thought my water was clear. I have now recalibrated as to what clear really is. Also, it is sparkling. I saw a thread where somebody asked what does sparkling mean. It's a little hard to explain but I definitely know it when I see it and my pool is now sparkling.
    Approx. 20k gal, kidney-shaped, inground, concrete pool built in 1974. 33' long. 18', 14', & 15' across. 3' to 8' deep. Hayward cartridge filter (c1200e). 1 hp, single speed motor replaced 12/2015. In-line Pentair 320 Chlorine/Bromine feeder (do not use). Screened.

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