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Thread: Question about draining my pool and my grass

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    rodog123's Avatar
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    Question about draining my pool and my grass

    When that inevitable time comes when my CYA gets too high (cause I'm using pucks) and I need to drain my pool, can I use the pool water on my grass?

    Will my grass burn because of Ph? Should I adjust Ph before hand then partially drain?

    Currently CYA @ 45.

    I know, I know what is this guy doing using pucks?
    Completed 38'X21' IG Free form pool approx 18.5K gallons, sports pool w/spa and tanning shelf 3.5-5.5 ft. Jandy Cartridge Filter, Jandy stealth pumps, Jandy LXi Heater, I aqualink, Inline chlorinator. Click to see My Pool Build

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    pwrstrk's Avatar
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    Question about draining my pool and my grass

    I gotta ask! Why don't you stop using them ?😎
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    Re: Question about draining my pool and my grass

    I gotta ask! Why don't you stop using them ?��
    Am asking the same question.
    Randy H.

    Intex 18' X 48"
    G.A.M.E. Sandpro 75 Sand Filter (Single Speed 3/4 HP, 75 lbs sand, 2650 GPH, 7-way valve)

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    rodog123's Avatar
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    Re: Question about draining my pool and my grass

    I know, I know geez.... When I do drain my pool can I use that water on my grass without burning it?
    Completed 38'X21' IG Free form pool approx 18.5K gallons, sports pool w/spa and tanning shelf 3.5-5.5 ft. Jandy Cartridge Filter, Jandy stealth pumps, Jandy LXi Heater, I aqualink, Inline chlorinator. Click to see My Pool Build

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    pwrstrk's Avatar
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    Re: Question about draining my pool and my grass

    I think you should be ok. Now, why don't you stop using them ?
    Jeff
    24'x54" AG Morada RTR (by wilbar) 13'500 gal. Hayward Powerflo Matrix 1hp 2 speed. Hayward Perflex EC65 DE filter.

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    rodog123's Avatar
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    Re: Question about draining my pool and my grass

    Thanks pwrstrk. Well as you may or may not know I'm a first time pool owner going on 4months. So I'm reading and studying the TFP method. I wanted to "learn" my pool equip and the chemicals first before I started the TFP method.

    I saved at least $750 by maintaining the pool myself so far this year. We were going to pay someone.

    I figure I will attempt to make the switch next swimming season, I plan on hiring a company to use chlorine gas.
    Completed 38'X21' IG Free form pool approx 18.5K gallons, sports pool w/spa and tanning shelf 3.5-5.5 ft. Jandy Cartridge Filter, Jandy stealth pumps, Jandy LXi Heater, I aqualink, Inline chlorinator. Click to see My Pool Build

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    Mod Squad tim5055's Avatar
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    Re: Question about draining my pool and my grass

    Quote Originally Posted by rodog123 View Post
    I figure I will attempt to make the switch next swimming season, I plan on hiring a company to use chlorine gas.
    There are companies that will use chlorine gas? I thought they all used pucks......
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    rodog123's Avatar
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    Re: Question about draining my pool and my grass

    Yes, there are a couple in the Houston area that use chlorine gas. The charge about $69 per month and come out weekly.

    A majority of pool companies use pucks or just shock your pool weekly. The ones I've been looking at either use liquid chlorine or chlorine gas.
    Completed 38'X21' IG Free form pool approx 18.5K gallons, sports pool w/spa and tanning shelf 3.5-5.5 ft. Jandy Cartridge Filter, Jandy stealth pumps, Jandy LXi Heater, I aqualink, Inline chlorinator. Click to see My Pool Build

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    Mod Squad tim5055's Avatar
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    Re: Question about draining my pool and my grass

    Quote Originally Posted by rodog123 View Post
    Yes, there are a couple in the Houston area that use chlorine gas. The charge about $69 per month and come out weekly.

    A majority of pool companies use pucks or just shock your pool weekly. The ones I've been looking at either use liquid chlorine or chlorine gas.
    I know it's your pool and you can do what you like, but that seems like a lot of money. The one company I found on line did what you sa, but all they did was add chlorine and CYA. No cleaning or other maintenance.

    For the cost of a few months of this service you could install a Stenner pump and automate the addition of liquid chlorine.

    I did find a post from chem geek from 2009 regarding these services
    There's a pool service in Arizona, Nevada, Texas and southern California called Pool Chlor and they use mostly chlorine gas without the problems you mention (as far as I know -- do you know which pool service it was that had the problems you have seen?), but they test the chemistry and dose known amounts. Their pools have high CYA of around 100 ppm which helps keep the chlorine from breaking down as quickly in the intense hot desert sun. They typically dose up to around 14 ppm FC and a week later the FC has dropped to around 4 ppm so this is sufficient to prevent algae growth and is a range of active chlorine that doesn't irritate. 14 ppm FC with 100 ppm CYA has the same active chlorine concentration as 4 ppm FC with 30 ppm CYA. As for pH control, they just have a higher Total Alkalinity (TA) level, usually around 120-140 ppm. Even with 120 ppm TA and 100 ppm CYA, going from 4 ppm FC to 14 ppm FC using chlorine gas lowers the pH from 7.5 to 7.2 or from 7.7 to 7.34. The pH then rises slowly over the week as carbon dioxide is outgassed (TA is a mostly a measure of the over-carbonation of the water). In 15,000 gallons, one would need to add about 5 cups (about 3 pounds) of baking soda to maintain the TA level over the week (the TA would drop by about 15 ppm over a week due to the combination of outgassing, which raises pH, and chlorine usage, which is acidic and lowers pH and TA). So using chlorine gas can work very effectively IF you know what you are doing. As with anything else, if you don't know what you are doing, serious problems can occur.
    I'm not sure if his opinions/statements still stand regarding this issue as a lot of knowledge has been gained in five years.

    But hey, like I said it's your pool and money. Live life like you like!!
    TFP Moderator 39 X 18 23,000(ish) freeform gunite; built 2007ish; Pentair Triton II TR100 600lb Sand filter; 2 HP Pentair pump with 2.2 HP AO Smith single speed motor; 2 skimmers, 1 main drain, 4 returns w/waterfall, Stenner 45MHP2 3GPD running@ 60% - 15 gal Tank; heated by the sun CYA 200+ when I started - 50 now. Dolphin Supreme M5 Pool Cleaner. Hot Springs SX Spa, 285 gallon

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    Re: Question about draining my pool and my grass

    If your FC is very high, you can lower it before adding water to the grass. If you do this fairly quickly, dechlorinating, adding water, then adding chlorine back, you shouldn't get algae. Grass should tolerate a few ppm FC, but if you are at 10 or so I'd lower the FC first. Either that or quickly dilute what you add to the grass which you should probably do anyway, mostly to dilute the salt level.

    As for what I wrote about chlorine gas from pool services, that is still accurate.
    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"

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    rodog123's Avatar
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    Re: Question about draining my pool and my grass

    Thanks for the post.

    Good to know Chem geek thanks!

    This chlorine gas provider comes highly recommended form several people in my neighborhood. I've checked them out (angies list) and they have been in business going on 15 years. My guess if they had troubles/complaints they would not be in business any longer.

    Maybe down the road I will consider changing to a Steiner pump, but right now all my equipment is new and I've only had the pool going on 5 months.

    My wife and and I have have pretty hectic schedules with work and grad school, so its hard to find the time right now for pool maintenance. I was able to maintain during the summer break but now that school is starting up again its been tough.
    Completed 38'X21' IG Free form pool approx 18.5K gallons, sports pool w/spa and tanning shelf 3.5-5.5 ft. Jandy Cartridge Filter, Jandy stealth pumps, Jandy LXi Heater, I aqualink, Inline chlorinator. Click to see My Pool Build

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    Re: Question about draining my pool and my grass

    Quote Originally Posted by rodog123 View Post
    When that inevitable time comes when my CYA gets too high (cause I'm using pucks) and I need to drain my pool, can I use the pool water on my grass?

    Will my grass burn because of Ph? Should I adjust Ph before hand then partially drain?

    Currently CYA @ 45.

    I know, I know what is this guy doing using pucks?
    Well, when I backwash I take the hose and use it to water my lawn, as I can't see wasting water. Never had any issues. My ph is always 7.4-7.6 and fc at 9 with a cya of 55.

    Oh, and stop using pucks!!
    Partially buried Doughboy Desert Spring 16 x 32, sport pool, with 7 ft deep middle, 20,000 gallons, Hayward Powerflo Matrix 1.5 HP 2 speed pump, 250 lb sandfilter, 2 Doughboy skimmers and 2 returns. 2 cascade fountains.
    Taylor K-2006 kit. Zodiac Barracuda Ranger suction side cleaner.
    TFPC method and is crystal clear every day thanks to TFP!!!

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    boston62's Avatar
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    Re: Question about draining my pool and my grass

    I was dumping mine benind my hedges, well that end of the hedges didnt grow as much as the rest, grass also didnt like the salt. Dumping mine now in the storm drains,
    .
    13,000 Gal Pool & Spa
    Jandy Automation /w IAqualink
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    Taylor (FAS-DPD K-2600, Pool Surface: Plaster

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    rodog123's Avatar
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    Re: Question about draining my pool and my grass

    Thanks everyone! Much appreciated.
    Completed 38'X21' IG Free form pool approx 18.5K gallons, sports pool w/spa and tanning shelf 3.5-5.5 ft. Jandy Cartridge Filter, Jandy stealth pumps, Jandy LXi Heater, I aqualink, Inline chlorinator. Click to see My Pool Build

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    Re: Question about draining my pool and my grass

    withdrawn
    16x32 DiamondBrite kidney, 12,500 gal. (circa 1985) 3/4hp Hayward SII, Harmsco BF84, Taylor K-2006, Hayward SwimPure Plus / Tcell-15
    Boca Roton, Fl. USA.

    prior 17k gal. vinyl, Sand filter

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