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Thread: Brown dust

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    Brown dust

    On the bottom of my pool has a brownish dust on it, when I vacuum or get close to the vacuum it disappears. After I let the water filter it settles back. What could this be?

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    pabeader's Avatar
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    Re: Brown dust

    what kind of filter do you have? it might be DE if you have that kind.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    Re: Brown dust

    I have a sand filter. After I used floc is when this happened.

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    Re: Brown dust

    That is what floc is supposed to do, I think. We don't use it here so I'm not real sure...
    Just move super slow when you get near it.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    Re: Brown dust

    Its confusing I vacuumed all of it up besides the same few spots, because they disappear. I have a brush vac but also one with the wheels. I just added 2lbs of shock and 2 3' chlorine tabs.

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    Re: Brown dust

    We have a different method of pool care here. No 'shock' No 'pucks' Just a few simple things from the grocery and hardware store. Never go to a pool $tore again. OR at least, very, very rarely.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    Re: Brown dust

    These products came from Wal-Mart. I dont do the pool store thing.

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    Brown dust

    Our stuff come from the Laundry aisle.
    Bob - Palm Beach by San Juan Pools. approx 5000 gals., Pentair 320 cartridge filter (all new guts installed by me), Goldline SWG, 'New to me' Kreepy Krauly Sand Shark, Intermec 104 Timer Test kit: TF-100 w/Speed Stir

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    Brown dust

    On the bottom of my pool has a brownish dust on it, when I vacuum or get close to the vacuum it disappears. After I let the water filter it settles back. What could this be?

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    Richard320's Avatar
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    Re: Brown dust

    Dust bunnies on the floor that disappear when you approach them with a vacuum or brush is classic algae behavior. It's mostly dead stuff. You need to kill all of it.

    It sounds like you're not maintaining adequate chlorine for your stabilizer level. Can you post test results? And how are you chlorinating?
    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: Brown dust

    I use 'pucks' for right now. I just added 2lbs of shock and 2 3' chlorine 'pucks'

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    Re: Brown dust

    Quote Originally Posted by Hubbert21 View Post
    I use 'pucks' for right now. I just added 2lbs of shock and 2 3' chlorine 'pucks'
    The pucks raise the CYA level, which may or may not be a good thing. The "shock" could be adding more; there are at least three different powders that are called shock and two of them do. They also mess with the pH. In brief, you might be making a bad situation worse. Anyway.... the solution remains the same as before I can't improve on the answer you got before.
    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: Brown dust

    I have the Aqua Chem 6 way test strips for now. (I know better test kit) but anyway my results are
    total hardness-100
    total chlorine-0
    free chlorine-0
    pH-7.2
    total alkalinity-120
    stabilizer-50

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    Richard320's Avatar
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    Re: Brown dust

    Quote Originally Posted by Hubbert21 View Post
    I have the Aqua Chem 6 way test strips for now. (I know better test kit) but anyway my results are
    total hardness-100
    total chlorine-0
    free chlorine-0
    pH-7.2
    total alkalinity-120
    stabilizer-50
    If you believe those strips, your CYA is 50 so your minimum FC should never dip below 4 and you should target more like 7 every day. Your CYA will be slightly higher when those pucks are done dissolving, so 8 FC might not be a bad target for you. Pool School - Chlorine / CYA Chart
    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: Brown dust

    So do you know what I need to add? The water is blue just slightly cloudy.

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    Re: Brown dust

    Quote Originally Posted by Hubbert21 View Post
    So do you know what I need to add? The water is blue just slightly cloudy.
    Not to step on Richard's toes here (since I would listen to him like gospel) but you need to add chlorine (preferably bleach or sodium hypochlronite).

    You can use the Pool Math link on top to calculate how much you need to add. Plug in the numbers for number of gallons of water in your pool, FC = 0, ph = 7.2, etc. For your target for FC you want 8. Then mouse over to the right hand section and specify what kind of chlorine you plan to put in. The calculate will then tell you how much to add if you put your mouse over the appropriate metric.
    20x40 L-shape 35k gallons, Pentair FNS 60 SQFT DE Filter, Pentair Multi-port Valve, Hayward Super Pump w/1 glorious HP, Vinyl Liner, Dolphin Z5, TF-100 w/Speed Stir

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    Re: Brown dust

    Desperate situations like yours need to be addressed acurrately and swiftly. You can not do either at this point in time without a test kit. You are right in the middle of a bloom and unless you take your pool by the rafts and kick this bloom out of your pool, you're going to watch it take over.

    You need a TF100.
    Post accurate test results.
    Bleach.
    Pool School links on how to defeat algae.

    You may not want to hear it but this is what you need to clear your pool. Well be here when you decide to do it the right way.
    I'd bet you my bikini you'll never get TFP water from a pool store!

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    Re: Brown dust

    Quote Originally Posted by Hubbert21 View Post
    So do you know what I need to add? The water is blue just slightly cloudy.
    As Richard said, read the Chlorine CYA Chart to determine what your chlorine level is for your CYA level. Never let the chlorine drop below the minimum level for your CYA level or algae will grow.

    Here are some of my fave Pool School articles in case you missed any of them.
    TFPC for Beginners
    ABC's of Pool Water Chemistry

    Here are the Recommended Levels for your pool.
    Here are the Recommended Pool Chemicals and how to add them.
    Use PoolMath to figure out how much to add.
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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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