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Thread: PH Down (powder) vs Muriatic Acid.

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    Join Date
    Apr 2009
    Location
    Burlington, ON, Canada
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    325

    PH Down (powder) vs Muriatic Acid.

    Hi all. New user, first post. Great site.

    So I had my water tested at the pool store (Pioneer Pools). I don't have a decent kit yet (can't find the TF-100 in Canada - not easily anyway). My PH was 7.8, stabilizer was 25, TA was 110, everything else was fine, though I don't know how my calcium went from 150 to 230 in two weeks all on it's own (another reason I want my own kit).

    Anyway, the computer tester the store uses suggested 'x' amount of PH Down, which is a powdered product the store sells. They also have muriatic acid for sale.

    It's $11.99 for 3kg of PH Down and the same price for 4 litres of muriatic acid.

    Should I be using one over the other being a salt water pool? Is four litres a better deal than 3kg for the same price?

    Thanks.
    16x28 Roman, 55000 litres, salt water, Zodiac Duoclear 130 (mineral cartridge removed!!!), inground, vinyl liner
    Hayward Tri-star 1HP (1.85) pump, Hayward sand filter
    Nine Fafco Sunsaver 4x10 solar panels, Jandy LX 250 natural gas heater
    Jandy Aqualink PDA with Sub Panel Power Centre

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    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: PH Down (powder) vs Muriatic Acid.

    Welcome to TFP!

    In those quantities, if the muriatic acid is 20 Baume 31.45% that quantity will lower the PH by almost twice as much as that quantity of PH Down (which we call dry acid).

    Also, with a SWG there is a long term risk of cell damage if you use dry acid.
    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

  3. Back To Top    #3

    Join Date
    Apr 2009
    Location
    Burlington, ON, Canada
    Posts
    325

    Re: PH Down (powder) vs Muriatic Acid.

    Thanks for the quick reply. What kind of damage does the powder cause to the cell?

    The Duoclear comes with a lifetime warranty on the cell (as long as I replace the mineral cartridge yearly - yes, I know most of your opinions regarding this cartridge). They say it should last 3-5 years and when it quits I get a free replacement. What I need to figure out is how much a new cell costs vs $100 a year for the cartridge and see if I come out ahead.
    16x28 Roman, 55000 litres, salt water, Zodiac Duoclear 130 (mineral cartridge removed!!!), inground, vinyl liner
    Hayward Tri-star 1HP (1.85) pump, Hayward sand filter
    Nine Fafco Sunsaver 4x10 solar panels, Jandy LX 250 natural gas heater
    Jandy Aqualink PDA with Sub Panel Power Centre

  4. Back To Top    #4

    Join Date
    Apr 2009
    Location
    Burlington, ON, Canada
    Posts
    325

    Re: PH Down (powder) vs Muriatic Acid.

    Belive it or not, the Home Depot near me doesn't carry muriatic acid. I checked a RONA store (like a Home Depot but Canadian) and they have it for the same price as the pool store ($11.99), but the salesman told me some guy came in on the weekend and bought all the four litre jugs because he was opening his pool. He must be a member here..hahaha.

    Anyway, I found two four litre jugs at the Canadian Tire for $8.99 in the paint dep't. It is 20 Baume etc. After donning my level 4 biohazard suit, I poured 12 ounces in front of the deep end return.

    I caught a whiff of this stuff as it was going in - wow! Powerful stuff. Is it OK to swim shortly after pouring this MA in?
    16x28 Roman, 55000 litres, salt water, Zodiac Duoclear 130 (mineral cartridge removed!!!), inground, vinyl liner
    Hayward Tri-star 1HP (1.85) pump, Hayward sand filter
    Nine Fafco Sunsaver 4x10 solar panels, Jandy LX 250 natural gas heater
    Jandy Aqualink PDA with Sub Panel Power Centre

  5. Back To Top    #5
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887

    Re: PH Down (powder) vs Muriatic Acid.

    Give it 30 minutes to mix in and then it is totally safe. It is probably safe well before that, but it is nice to be totally sure.
    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

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