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Thread: Considering a SWG but want an alternative to using acid

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    Considering a SWG but want an alternative to using acid

    Hello all!

    I am considering having a SWG put in my pool, however I don't really want to deal with adding acid that often if possible. So at the same time that I put in a SWG we are considering adding something called an ORGANIC PH unit http://www.poolsmith.com. It uses CO2 to keep the PH where it needs to be. My pool is about 18000 gallons so I would require 2 35lbs CO2 tanks, and they would have to be refilled about once every 3 months. Of course I'm not sure of the cost yet on refills, but I may also be able to just have a 50lbs tank put in and then have a service contract done to refill it on site for me.

    So my questions are as follows:
    1. Has anyone ever heard of this option?
    2. Does anyone know if this works well? Even if there is added costs, if it works, I would rather have this "safer" method.
    3. Aside from cost what would be the drawbacks of this? (Chemistry issues)

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    Armyb77
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    maxepr1's Avatar
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    Re: Considering a SWG but want an alternative to using acid

    I looked into the sense and dispense system and decided not go that route just due to the expense! Also every pool is different, so I'm not sure who told you the bottles would last 3 months. You may go through a bottle a month or a bottle every 3 months! Refills in my area where at the time (2 years ago) $60 a bottle and that was a small bottle. Why are you opposed to MA? You could build yourself a dosing system that way you may only be dealing with it maybe once a week. How much acid are you using now?
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    Re: Considering a SWG but want an alternative to using acid

    Really my consumption isn't that bad (~32oz a week) but it's just something I don't want to mess with, I'm trying to go as chemical free as possible. This would make it so I don't have to worry about the kids or pets getting into the stuff. This is the reason I said aside from cost what are some of the other drawbacks?

    The 3 months was given from the poolsmith vender they said 2 35lbs tanks should last 3-5 months depending on the chemistry of the pool.

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    Armyb77
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    maxepr1's Avatar
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    Re: Considering a SWG but want an alternative to using acid

    Army, I only talked with one person that I knew who had the Hayward system and he was not pleased. Constant leaks in the tubing, losing his gas. Installer had been out numerous times for service. Funny thing was the installer was being trained by a Hayward Tech. specialist on installing these systems!
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    mas985's Avatar
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    Re: Considering a SWG but want an alternative to using acid

    I built my own dispensing system and still using it. Here is the thread: homemade-acid-or-chlorine-injection-system-t4174.html
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

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    Re: Considering a SWG but want an alternative to using acid

    I use CO2 in my brewing system, and leaks are a common problem. You usually discover it when the tank is empty and burn through 1-2 more before you get it resolved.
    My Pool: 18'x36' Grecian. Vinyl Liner, 500# sand filter, SWG.

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    JasonLion's Avatar
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    Re: Considering a SWG but want an alternative to using acid

    Using CO2 to regulate PH tends to raise the TA over time. The net effect is that you end up needing to use acid, but only at fairly long intervals.

    If you balance your levels correctly, and don't have a waterfall or negative edge or similar large amounts of aeration, the PH increase is very very small. I ended up adding acid to my pool (with a SWG) exactly once last year.
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    maxepr1's Avatar
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    Re: Considering a SWG but want an alternative to using acid

    Army, I've got the same set-up as Mark. Works like a champ!
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    Re: Considering a SWG but want an alternative to using acid

    I'm running a Kegerator with a 5lbs CO2 canister, and I do leak tests so I have been fortunate enough to not have any problems so far. Of course it's only $7 to refill, so I'm not too worried about it if it did, but this would be much more expensive (probably $45~60) so extra care would have to be taken to ensure there are not leaks.

    I like the Homemade Acid injector, I'm just not sure I want to tinker that much and I also don't know the long term effects that it would cause to my pump

    JasonLion answered the question I think though with the TA increase...thanks!

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    Armyb77
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    Re: Considering a SWG but want an alternative to using acid

    Army - one tap, or even one pressure, is fairly easy. When you star adding 3 or 4, the number of fittings, gauges, valves makes leaks more common.

    Brew your own?
    My Pool: 18'x36' Grecian. Vinyl Liner, 500# sand filter, SWG.

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    Re: Considering a SWG but want an alternative to using acid

    The first couple years I had my salt water pool, I was stunned at the PH rising up all the time. Initially, I was using PH down powder until I found troublefreepool. Then I switched to muriatic acid, which I found to be much cheaper than the powder at the pool store. Still, I found myself adding MA farily regularly (maybe four litres in a month).

    After more research here at troublefreepool, I lowered my TA to 70 from 110 and the PH drifting up slowed dramatically. Last year I added 50ppm of borates and I think I added MA acid twice the entire summer.
    16x28 Roman, 55000 litres, salt water, Zodiac Duoclear 130 (mineral cartridge removed!!!), inground, vinyl liner
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    Re: Considering a SWG but want an alternative to using acid

    Quote Originally Posted by DeadAquaRite
    Army - one tap, or even one pressure, is fairly easy. When you star adding 3 or 4, the number of fittings, gauges, valves makes leaks more common.

    Brew your own?
    No I haven't made the jump to brew my own, but that is mainly because I don't think the wife would allocate me the space or the kitchen to do it...laughs

    I do have friends that bottle their own and offered to brew me a corny if I bought one. Right now I'm running Yuengling Bock on tap!
    This is a nice vintage t-shirts

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    mas985's Avatar
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    Re: Considering a SWG but want an alternative to using acid

    Quote Originally Posted by armyb77
    I like the Homemade Acid injector, I'm just not sure I want to tinker that much and I also don't know the long term effects that it would cause to my pump
    It doesn't effect the equipment because the change in PH at the injection point is very small (<0.2 PH drop) so it isn't much different than adding the acid to the pool and dropping the PH. In fact, it is probably better because dosing a pool with acid tends to have larger swings while continous dosing keeps the PH at a near constant level.

    Also, you can add a peristaltic pump to make the dosing more precise to take out some of the guess work.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
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    Re: Considering a SWG but want an alternative to using acid

    Right now I'm running Yuengling Bock on tap!

    Good times there!!
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