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Thread: The sin of threading a Stenner line into a puck holder

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    The sin of threading a Stenner line into a puck holder

    Hi folks--

    I have a pool--my first--for which construction will probably be finished in a week or two. I've pretty much decided to build myself a liquid chlorine pump system, but I didn't settle on this until after the plumbing and equipment were complete.

    Reading through old Stenner threads, I see that the practice of threading the injection line into a 1/2" port of a chlorine puck holder is roundly discouraged... but I'm not really clear why. People say, reasonably enough, "don't mix chemicals." But what, more specifically, would be the risk of injecting bleach into a tank holding a solid chlorine puck? Something terribly exothermic? Something that generates gas? What's the realistic worst-case if somebody screws up?

    The above-ground PVC plumbing in my system is pretty compact, and I'll have to dig stuff up if I want to have enough slack in the lines to insert a tee to mount an injection port properly. So I'm tempted to just jack the Stenner line into my puck holder for the first season, to make sure that I'm satisfied with this setup as a permanent solution. Still, I won't do this if I have some more concrete idea of what bad outcome I'm avoiding.

    Thanks!
    St. Louis, MO. White plaster, 31,000 gallons. Pentair Intelliflow 4x160 variable-speed pump; Stenner pump w/ timer for chlorine injection; Pentair System 3 media filter; gas heater.
    Heater and pump powered by double-distilled unicorn tears, judging from my utility bills.

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    CJadamec's Avatar
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    Re: The sin of threading a Stenner line into a puck holder

    I forgot exactly what the reaction was but you got it. There is potential for a serious and damaging reaction if you mix liquid chlorine with pucks. Even the left over chunks of a puck are enough to cause a problem. They are two things you really don't want to chance mixing on accident say if somebody comes along who doesn't know the pool ( like you sell your house, or go on vacation and ask somebody to watch your pool) and adds pucks to the feeder then turn on the chlorine pump.

    Are there any tee or 90 fittings in your return line exposed? The double thickness of PVC in those areas will allow you to thread and tap an 1/8 or 1/4 inch NPT fitting right into the line without having to cut and re-glue anything.

    Another option is to remove the inline feeder (you aren't going to use it anymore right?) and put your injection port there.
    Chuck-
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    Mod Squad kimkats's Avatar
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    Re: The sin of threading a Stenner line into a puck holder

    It is the danger of the toxic gas....it is bad stuff. Our biggest worry when people say "but I won't put a puck/tablet in the tube" is that SOMEONE else might. It is a very dangerous thing to even take a chance on.

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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    Re: The sin of threading a Stenner line into a puck holder

    Here is the result of liquid chlorine + dry chlorine + water.

    danger in pool chemicals - YouTube


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    Re: The sin of threading a Stenner line into a puck holder

    I don't know what puck holder you have, but I was able to unscrew the tower part of my Pentair Rainbow, leaving the diverter tee in place - and made an adapter to go where the tower was. Adapter was made up of a 1.5" threaded coupling and 1.5"x0.5" reducer bushing.
    Graeme // 15k gal 29x15 geometric IG w/750 gal spa, Wet Edge Northshore Tahoe, travertine coping and decking, Clean & Clear Plus 420 sq ft cartridge filter, Intelliflo VS pump, 1hp water feature pump, Easytouch 8 w/wireless handheld, Racer pool cleaner, 400,000 BTU Max-E-Therm heater, Stenner 45MPHP10 w/15 gal tank, Intellibrite 5G LED lighting, bubblers, pencil jets, TF-100 w/SpeedStir, Borates & Salt. Finished and filled June 2015!

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    Re: The sin of threading a Stenner line into a puck holder

    There's an elbow that I could potentially tap into, and I've got a tap set collecting dust in my basement, but I'm somewhat worried about whether the result would be reliably water-tight. I'm good with solvent-welding but haven't done a lot of tapping into lines.

    I'll have to look more carefully about whether the solid chlorine holder is removable. I'll try to post a picture this evening...
    St. Louis, MO. White plaster, 31,000 gallons. Pentair Intelliflow 4x160 variable-speed pump; Stenner pump w/ timer for chlorine injection; Pentair System 3 media filter; gas heater.
    Heater and pump powered by double-distilled unicorn tears, judging from my utility bills.

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    poolnewbies5874's Avatar
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    Re: The sin of threading a Stenner line into a puck holder

    Our stenner is threaded into the puck holder.

    Puck holder was installed by pb and right after I discovered this forum. We never used tablets and never plan to so with them not even being in our household theres no chance the two will ever get mixed. If for some reason we ever sell the house then we'll deal with moving it so nothing happens under new ownership.

    12,000 gallon Blue Hawaiian 'Hamilton' fiberglass IG 15x34 freeform, Pebble Beach finish, Pentair Clean & Clear 100 filter cartridge, Pentair SuperFlo 1.5HP pump, Stenner pump, Raypak 266k heater
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    Re: The sin of threading a Stenner line into a puck holder

    Glue the top of the chlorine feeder so no one can access it.
    8500 gallon IG Pebble Sheen with Spa. 3hp Pentair VS Intelliflo ( pool ), 3/4 hp WhisperFlo ( water feature ),Pentair Racer, 400K Pentair heater, Pentair 500sqft Cartridge filter, EasyTouch 8, Stenner 45mp2 15gallon wired to ET8

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