Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 8 of 8

Thread: Muriatic Okay With DE and CYA?

  1. Back To Top    #1

    Join Date
    Apr 2015
    Location
    Pasadena, CA
    Posts
    56

    Muriatic Okay With DE and CYA?

    I have a vinyl deck box out near my pool where I keep my Muriatic acid. It stays locked so the kids, pets and critters don't get into it. Just wondering if it's safe to also store CYA and diatomaceous earth in the same box? I've read some things are a no no, so just checking. Thanks.
    22,000 gallon IG plaster pool, raised spa w/spillover, variable speed EcoStar pump, natural gas heater, 60 SF DE filter, SWG (all Hayward), AquaLogic automated controller, Kreepy Krawly, TF-100 Test Kit

  2. Back To Top    #2
    DaninFLA's Avatar
    Join Date
    Apr 2015
    Location
    Sarasota, FL
    Posts
    1,011

    Re: Muriatic Okay With DE and CYA?

    i don't believe MA bottles vent, like chlorine, but not sure.
    Dan
    9,000 gallon in-ground Saltwater pool, plaster, cartridge filer, 1.0 hp pump, Hayward T-15 SWCG, TF-100
    Pool School - Chlorine / CYA Chart; Pool School - Test Kits Compared;

  3. Back To Top    #3

    Join Date
    Oct 2015
    Location
    Katy/Texas
    Posts
    411

    Re: Muriatic Okay With DE and CYA?

    My MA and bleach bottles have seals under the cap. So it is not possible for them to vent before the first time you open them.
    In ground, 14,000 gallon, white plaster, unheated, stone waterfall, DE Filter, Rainbow 320 Cl, Polaris 3900, FloVis flow meter, F100 test kit, Circupool RJ30+ SWG, Circupool VJ1/Speck Badu EcoM3V variable speed pump.

  4. Back To Top    #4

    Join Date
    Jan 2014
    Location
    Buckeye AZ
    Posts
    807

    Re: Muriatic Okay With DE and CYA?

    mine too but the seal has a pinhole in it....
    10,500 gal IG, Topaz Pebble, auto-level
    Hayward DE filter, 2HP Ecostar VSP, ProLogic PS-4, GVA actuators
    Cal Pools Wave Force Plus (wall return jets plus 2 floor pop-ups), Venturi Skimmer
    Water sheer, 2 wok pots, bubbler stem on the baja step
    ColorLogic Mutlicolor LED lamp. Taylor 2006+speed stir

  5. Back To Top    #5
    JoyfulNoise's Avatar
    Join Date
    May 2015
    Location
    Tucson, AZ
    Posts
    11,606

    Re: Muriatic Okay With DE and CYA?

    You can store acid with CYA and DE. There is no problem there. Bleach and acid MUST be stored separately. Bleach should NEVER be stored outdoors nor stockpiled for long periods of time as it degrades within months. It would be best to make sure your deck boxes are properly vented or else acid vapors can build up and be quite irritating.
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

  6. Back To Top    #6

    TFP Guide

    chiefwej's Avatar
    Join Date
    Jun 2011
    Location
    Tucson
    Posts
    2,853

    Re: Muriatic Okay With DE and CYA?

    Make very sure that there is nothing in there that acid fumes can corrode or ruin.
    chiefwej
    Tucson, AZ
    16x36 rectangular (19k) Pebble Tec play pool/spa, Pentair Intelliflo VS 011018, Super II 2hp (spa), Aqua Rite T-15 SWG, Pro Grid 60 DE, Hayward H400 & Heliocol Solar heating, A&A infloor system, fill water w/high CH and TA, 50 ppm borates,TF-100 test kit

  7. Back To Top    #7

    Join Date
    Apr 2015
    Location
    Pasadena, CA
    Posts
    56

    Re: Muriatic Okay With DE and CYA?

    Thx everyone! Yes the box is vented just by bad design. It's not airtight.

  8. Back To Top    #8

    Join Date
    Mar 2007
    Location
    San Rafael, CA USA
    Posts
    12,082

    Re: Muriatic Okay With DE and CYA?

    Full-strength Muriatic Acid (31.45% Hydrochloric Acid) has a high vapor pressure at higher temperatures. This paper and page 2-76 in this paper show that the vapor pressure of the acid at 40C (104F) is about 81 mm Hg or about one-tenth of an atmosphere pressure. Water vapor pressure adds another 18 mm Hg on top of that. So some bottles of Muriatic Acid have vented caps while those that are sealed need to withstand these or higher pressures.

    Normally the "safer" Muriatic Acid that is < 25% or the half-strength that is 15-16% is in sealed bottles since the pressure is not nearly as high. The acid fumes significantly less. The half-strength has roughly 1/280th the vapor pressure from the acid while even 25% has 1/14th the vapor pressure from the acid.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •