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Thread: Homemade Chlorine Injection System

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    tcat's Avatar
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    Homemade Chlorine Injection System

    Split off of this topic.

    Think I'm going to try this method. Curious if acid and Clorox can be mixed (in same blue jug). I assume not, but how about 2 jugs feeding into a "T" into the basket? A check valve on each line. Going to do the Clorox first, but curious about a dual method.

    I assume the blue jug has a hole open to atmosphere so it doesn't collapse, right?
    IG pebble, 15,000 gallon
    48” PentAir DE Filter with backwash valve
    PentAir Whisperflo pump with 1hp 2-speed motor
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    JasonLion's Avatar
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    Re: Homemade Acid OR Chlorine Injection System

    NO, do not mix chlorine and acid, either in the same jug or in feed lines. The concentrated solutions react to form chlorine gas, which is highly poisonous. Once mixed into the pool water everything is fine.
    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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    tcat's Avatar
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    Re: Homemade Acid OR Chlorine Injection System

    Kind of assumed th. I'm mainly needing the chlorine set up (4-8 oz. per hour of 8.25%). Anyone tried this type of valve?

    http://www.usplastic.com/catalog/item.aspx?itemid=29060

    Going to use 2 pieces of wood and a small clamp until I decide on a valve, but those look pretty "tweakable". Or is the 1/4" tubing you use too rigid?

    PS: What prevents pump from losing prime if tank has small vent hole? I know if I have a microscopic leak on the basket lid the pump will lose prime.

    edit: Started my install. Went to HD bought $21 of stuff (1/4" threaded to 1/4" adapter for connection to pump plug hole, 50' 1/4" vinyl tube, 1/4 to 1/4 ball valve, HD orange bucket and Lid). Filled the HD bucket with water 1 quart at a time and marked each line. First tested the ball valve to make sure no leaks. Barely opened the ball valve with one end of tube in bucket half full of water watching end to see when suction just started. Currently waiting an hour to see how many lines the level goes down. This is a test with no drip restrictors. Feedback later.

    edit 2: Definitely needs a needle valve or drip buttons. Went from about 2oz. per hour to 2quarts per hour, just tweaking ball valve about 3 degrees. Also, after pump is off, level in pail keeps going down. How to stop that? Is pail supposed to be air right? Going to experiment pinching tubing tomorrow.
    IG pebble, 15,000 gallon
    48” PentAir DE Filter with backwash valve
    PentAir Whisperflo pump with 1hp 2-speed motor
    Aquabot 4WD, Poolskim
    Intermatic Dual Timeclock with freezeguard
    DIY chlorine feed
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    DreamKiller's Avatar
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    Re: Homemade Acid OR Chlorine Injection System

    Just my 2 cents. I tried all last season to get a working setup. Even tried the pinch value you asked about. Never could get it to work well. Either too much flow or it clogged up in just a few days. Very tricky to get it to work reliably. So I ended up ripping it all out for the winter. Not sure I will try again this year. I am just about convinced an expensive injection pump is the only real sure way to go. Good luck! Let us know how well you get it to work.

    DreamKiller

    16'x32' IG 15k gallon gunite/plaster pool

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    tcat's Avatar
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    Re: Homemade Chlorine Injection System

    OK, the "pinch valve" doesn't really work well. As the day gets warmer the tubing gets softer and stops flow after it is tweaked in. I was able to get perfect flow with the cheap ball valve from Home Depot, but very difficult to tweak in. Pretty sure I can make the SMC needle valve from US Plastics to work. Looks like I'll need a check valve too, water drains out of the bucket "almost" as fast with pump off as with pump on (my equipment is at least 12" above pool level). It's very easy to get a flow reading using the 40ml tube from TF Test kit. Just fill with water with 1/4" tube in it and watch level. My goal is 5ml per minute (= 10 oz per hour), very easy to watch it for a minute. At most I add 32-40 oz per day, so a 5 gallon HD bucket is good for 2-3 weeks (if all goes well). Hello liquidator if not... just prefer DIY (even if the Liquidator was only $50).

    So a 3/16" check valve goes into a 1/4" OD tube? $22 more with shipping... so about $45 total, hopefully that will do it.

    64047 2 Each $0.76 $0.76 $1.52 3/16" PP Standard Check Valves
    22149 1 Each $10.87 $10.87 $10.87 1/4" FNPT x 1/4" FNPT PP Needle Valve
    60418 3 Each $1.15 $1.15 $3.45 1/4" Nom. Tube OD x 1/4" Male NPTF Black PP Male Connector
    IG pebble, 15,000 gallon
    48” PentAir DE Filter with backwash valve
    PentAir Whisperflo pump with 1hp 2-speed motor
    Aquabot 4WD, Poolskim
    Intermatic Dual Timeclock with freezeguard
    DIY chlorine feed
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    tcat's Avatar
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    Re: Homemade Chlorine Injection System

    Help! I have all my "parts", but can't get water (which will be Clorox) to stop draining from my Home Depot bucket when the pump is off.

    I have a connector to the drain port on the pump basket, to tubing, to check valve, to on/off ball valve, to bucket of water. When I open the ball valve water flows from the bucket fairly quickly (into the basket/pool).

    My pump is about 12" above water level, bucket is on pad next to pump. Does the bucket need to be below pool level?
    If I have an air leak I lose prime, so this is essentially an air leak. Do I seal the bucket lid? If so won't the bucket collapse on vacuum?
    IG pebble, 15,000 gallon
    48” PentAir DE Filter with backwash valve
    PentAir Whisperflo pump with 1hp 2-speed motor
    Aquabot 4WD, Poolskim
    Intermatic Dual Timeclock with freezeguard
    DIY chlorine feed
    BBB

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    mas985's Avatar
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    Re: Homemade Chlorine Injection System

    A check valve is only useful for below water level installations (e.g. AG pools). It prevents the bucket from refilling when the pump is off.

    However, for above water installations, the draw down should be much smaller with the pump off vs pump on.

    What is the draw rate with the pump on vs off?

    With a 1.5 HP pump, I would expect the suction to be much much higher with the pump on vs off so the draw rates should be a lot different.

    However, if the chlorine buildup in the pump basket is too large when the pump is off, really the only solution is to dig a hole to lower the bucket.

    My bucket bottom is close to water level and there is very little draw down when the pump is off.
    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: Homemade Chlorine Injection System

    Kind of what I guessed. Yes flow with on is much higher (although haven't put the needle valve in line yet). When I was playing with the ball valve the other day to get approx. 8 oz. per hour with pump on; I could still see the level going down with the pump off (probably close to the same rate since it's basically an air leak). I need to look closer at water level, a 12" deep hole could be a problem... how about a check valve with a set open force? Do they make something like that in plastic?
    IG pebble, 15,000 gallon
    48” PentAir DE Filter with backwash valve
    PentAir Whisperflo pump with 1hp 2-speed motor
    Aquabot 4WD, Poolskim
    Intermatic Dual Timeclock with freezeguard
    DIY chlorine feed
    BBB

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    Re: Homemade Chlorine Injection System

    how about a check valve with a set open force? Do they make something like that in plastic?
    You might check this out:
    http://www.usplastic.com/catalog/item.aspx?itemid=24234

    If the bucket is 12" above water level, then you would need one with a cracking pressure of about 0.5-1 PSI so the US plastics one should work but I am not sure about the chlorine crystal build up. It might need to be cleaned out periodically.
    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: Homemade Chlorine Injection System

    No problem after all. I only "thought" the water level was more than 12", but looking at my foundation around to the pump pad, the pad is about 3" above water level. I have a 6-9" deep rock landing around the pad, so I dug into the rocks, planted the bucket, and no more back flow! Will be tweaking my water flow and taking pictures next. Kind of nice, the chlorine will stay much cooler on hot day buried.
    IG pebble, 15,000 gallon
    48” PentAir DE Filter with backwash valve
    PentAir Whisperflo pump with 1hp 2-speed motor
    Aquabot 4WD, Poolskim
    Intermatic Dual Timeclock with freezeguard
    DIY chlorine feed
    BBB

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    mas985's Avatar
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    Re: Homemade Chlorine Injection System

    Let us know how it works out over time.
    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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    tcat's Avatar
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    Re: Homemade Chlorine Injection System

    Couple of pictures of set up. Testing flow with water for now, getting under 32 oz per hour is tricky!

    edit: Clorox is thicker than water! Makes it more difficult to tweak the valve, but think I have it. About 32oz. per my 4 hour pump cycle. So far FC hasn't gone below 6. The extra ball shut off is handy so you don't have to touch the needle valve. I can see why a Hayward needle valve would be worth the extra $$ if it has a finer adjustment.



    Used sprinkler filter at end of tubing just in case (pink plastic coat hanger for support).
    IG pebble, 15,000 gallon
    48” PentAir DE Filter with backwash valve
    PentAir Whisperflo pump with 1hp 2-speed motor
    Aquabot 4WD, Poolskim
    Intermatic Dual Timeclock with freezeguard
    DIY chlorine feed
    BBB

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    tcat's Avatar
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    Re: Homemade Chlorine Injection System

    Update. So far a few days and all is well. Clorox level goes down 28-32 oz per day, FC stays between 6 and 7.

    In the Orange bucket photo above, I used nylon cable ties to strap the tubing. The Clorox seems to weaken them, 3 were broken sitting at the bottom today. I replaced with larger ones, but does Clorox dissolve nylon?
    IG pebble, 15,000 gallon
    48” PentAir DE Filter with backwash valve
    PentAir Whisperflo pump with 1hp 2-speed motor
    Aquabot 4WD, Poolskim
    Intermatic Dual Timeclock with freezeguard
    DIY chlorine feed
    BBB

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    Mod Squad Bama Rambler's Avatar
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    Re: Homemade Chlorine Injection System

    Yes Chlorine attacks nylon. Try the black ones.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
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    Re: Homemade Chlorine Injection System

    Aren't you concerned injecting liquid chlorine on the suction side directly into the pump. Normally you would want that after the equipment.

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    mas985's Avatar
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    Re: Homemade Chlorine Injection System

    The chlorine is introduced at a extremely slow rate so it is highly diluted by the time it gets to the impeller. At most there is only a 1-2 ppm FC rise. No different than adding liquid CL to the pool and basically the same dilution ratios.
    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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    tcat's Avatar
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    Re: Homemade Chlorine Injection System

    No concern here. At 32oz in 4hrs., that's less than a tablespoon a minute... into a 32oz. basket. I'd fell out safe at 10x that rate. Big test is when I'm on vacation for a week... soon to find out.
    IG pebble, 15,000 gallon
    48” PentAir DE Filter with backwash valve
    PentAir Whisperflo pump with 1hp 2-speed motor
    Aquabot 4WD, Poolskim
    Intermatic Dual Timeclock with freezeguard
    DIY chlorine feed
    BBB

  18. Back To Top    #18
    tcat's Avatar
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    Re: Homemade Chlorine Injection System

    Follow up. Was off on vacation for 8 days.

    Before:
    FC = 4.5
    pH = 7.6
    TA= 80
    CYA = 45-50
    CH = 300

    After:
    FC = 3.5
    pH = 7.8
    TA= 80
    CYA = 45-50
    CH = 300

    Clorox level in tank down 1.75 gallons. Getting hot here, so will try tweaking flow up about 1/64 of a turn. So nice not worrying about chemicals until the weekend!
    IG pebble, 15,000 gallon
    48” PentAir DE Filter with backwash valve
    PentAir Whisperflo pump with 1hp 2-speed motor
    Aquabot 4WD, Poolskim
    Intermatic Dual Timeclock with freezeguard
    DIY chlorine feed
    BBB

  19. Back To Top    #19

    Re: Homemade Chlorine Injection System

    Tcat,

    Just wondering if your injection system is still working well. Might try to build one these for my in-law's AG pool.
    Springfield, Missouri
    DIY 18 x 36 vinyl IG, 3' 10"- 8' depth. Hayward Max Flo 1 1/2 HP VS pump, Ranger 30" sand filter, 2 skimmers, 2 main drains, 3 returns, 1 dedicated suction line, 2 colorlogic lights, and 3 Jandy deck jets, Dolphin Deluxe 5, Gulfstream HE125 heatpump

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    tcat's Avatar
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    Re: Homemade Chlorine Injection System

    I replaced my single speed motor with a 2 speed and had some issues on low speed, but I believe they are worked out. It's much harder to tweak the right feed rate on low, but I think I have it. FC ranges from 4-6 during the day with CYA of 40. My needle valve developed a crack and is temporarily "fixed" with teflon sealing compound. Not sure if I'm going to order another US plastics one for $10 or shell out the big bucks on a Hayward one (waiting to see if the teflon seal stays sealed)
    IG pebble, 15,000 gallon
    48” PentAir DE Filter with backwash valve
    PentAir Whisperflo pump with 1hp 2-speed motor
    Aquabot 4WD, Poolskim
    Intermatic Dual Timeclock with freezeguard
    DIY chlorine feed
    BBB

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