Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 7 of 7

Thread: SWG with hard water? Austin Tx area

  1. Back To Top    #1

    Join Date
    May 2013
    Location
    Austin, TX
    Posts
    69

    SWG with hard water? Austin Tx area

    We are very close to starting the build of our IGP. It'll be an approx 15000 gallon gunite pool. We thought we were going to go w/ SWG but are considering going w/ Chlorine (or BBB) now because we may go w/ Travertine coping and deck. Also, I was talking to one of the local pool builder suppliers/wholesaler and he told me that SWG combined w/ our local hard water isn't a good recipe. I know a lot of people in the Austin area have salt and seem to be happy, but I thought I'd get some opinions here. Anybody have any thoughts on this? Our 'hardness' is around 180ppm according to the city water supply report. I haven't ran a test at my house yet.
    34x17 Freeform Gunite IGP and spa (approx 17k gal)
    Hayward 2HP/2SP TriStar Filter Pump & Tristar Booster
    ProLogic PS-8 and AquaPod
    400k Heater
    CLI Sunstone Quartz Plaster

  2. Back To Top    #2

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

    Re: SWG with hard water? Austin Tx area

    That hardness level is not a problem, though with evaporation and refill your CH will rise unless you have significant water dilution. You just need to keep the TA lower and watch the pH as the CH climbs over time. Also, the use of 50 ppm Borates cuts the amount of pH rise in the SWG about in half so helps to prevent scaling there which is the concern of your builder/supplier.
    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"

  3. Back To Top    #3
    UN1017's Avatar
    Join Date
    May 2012
    Location
    Sacramento, CA
    Posts
    288

    Re: SWG with hard water? Austin Tx area

    CH levels alone are not an issue with using an SWG. It's the saltwater that could damage natural stone products if not sealed.

    As far as hardness goes, 180 is nothing. You should test your fill water though.... just to be sure.
    15'x30' IG - Roman-style - 14K - Pebble Fina Classico
    Filter: Jandy CL460 Pump: Jandy Stealth SHPF1.5 SWG: Jandy AquaPure 1400 Cleaner: Jandy RayVac Test Kit: TF-100 w/SpeedStir

    Chlorine/CYA Chart----Extended Test Kit Directions----SLAM

  4. Back To Top    #4

    TFP Guide

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

    Re: SWG with hard water? Austin Tx area

    I just did a full drain and refill because my CH was over 1,000. Now with my new fill, I'm staring out with CH 250. So 180 is nothing to be concerned about.

    However the use of stone with SWG can be a real problem. My PB's recommendation was "stone or salt, take your pick, but don't use both". I chose salt, and there is no stone anywhere near my pool. In Texas they use a lot of stone because its readily available and cheap. But it's also soft and is easily damaged by salt.
    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

  5. Back To Top    #5

    Join Date
    May 2013
    Location
    Austin, TX
    Posts
    69

    Re: SWG with hard water? Austin Tx area

    Thanks everyone. We know about the stone/salt incompatibility. If we go with salt we are doing everything with pavers. If we end up going to travertine, we'll go with a standard chlorine setup. I was just curious if the calcium/hardness in tbe water was a big enough deal that it would help sway tbe decision.

    34x17 Freeform Gunite IGP and spa (approx 17k gal)
    Hayward 2HP/2SP TriStar Filter Pump & Tristar Booster
    ProLogic PS-8 and AquaPod
    400k Heater
    CLI Sunstone Quartz Plaster

  6. Back To Top    #6

    TFP Guide

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

    Re: SWG with hard water? Austin Tx area

    Hard water just means you have to carefully manage your water chemistry to prevent scale. That is true regardless of your chosen chlorination method. SWG's do cause some pH rise, but lowering the TA and borates can help with that. You just need to study up in Pool School and learn to manage the CSI. If all that sounds confusing spend some time reading the info in Pool School until its all clear.
    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
    May 2013
    Location
    Austin, TX
    Posts
    69

    Re: SWG with hard water? Austin Tx area

    Quote Originally Posted by chiefwej
    Hard water just means you have to carefully manage your water chemistry to prevent scale. That is true regardless of your chosen chlorination method. SWG's do cause some pH rise, but lowering the TA and borates can help with that. You just need to study up in Pool School and learn to manage the CSI. If all that sounds confusing spend some time reading the info in Pool School until its all clear.
    Thank you! I'm learning....slowly but steadily.

    Thanks for all the great feedback everyone!
    34x17 Freeform Gunite IGP and spa (approx 17k gal)
    Hayward 2HP/2SP TriStar Filter Pump & Tristar Booster
    ProLogic PS-8 and AquaPod
    400k Heater
    CLI Sunstone Quartz Plaster

Posting Permissions

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