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Thread: Water turned slightly green...unusual.

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    borjis's Avatar
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    Water turned slightly green...unusual.

    Bit of a mystery here.

    I had a brand new Raypak heater installed last thursday.

    Added 4ppm of chlorine (unscented regular bleach) on saturday
    and ran the pump all day with the suction robot to clean the pool.
    This was the first addition of chlorine since last november.

    I am on city water, not well. The pool was fresh filled october 2015.
    I have never seen the water turn green before when adding chlorine.

    There is dilution by rain water that I have drained down a few times
    to keep the water at the correct level.

    I solely practice the tfp way (since 2014) and have never added any algecides
    or potions to this water. Just bleach, washing soda, baking soda and cya.


    I'm having a hard time believing it's metals from the city water, as that
    would have turned green during the fresh fill. And as mentioned above, i went
    and entire year plus without this happening.

    The heater is a new variable, i did not opt for the cupro nickel exchanger
    so I have whatever is standard. PH is good so I don't think copper from
    the new heater was leaching off, if thats a thing.

    Part of me wants to let the poolco that installed the heater know, but
    I don't want them dumping potions in the water or potentially making
    things worse.

    Do new heaters have residual chemicals from manufacturing that may have caused this?

    There was a thread where someone said they had this happen to them 3
    years in a row out of nowhere (getting slightly green after first year chlorine addition)
    but that it went away after a few weeks and their metal test came up as zero.
    Any of you experienced this?


    Here are my current TF-100 test results:

    water temp: 44 degrees

    FC: 4.0
    CC: 0.5
    PH: 7.5
    TA: 60
    CH: 150
    CYA: not registering (i lose it this time of year due to rain fills/drain downs dilution)


    Any suggestions much appreciated.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
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    Mod Squad kimkats's Avatar
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    Re: Water turned slightly green...unusual.

    I am following to learn with you

    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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    Mod Squad JohnT's Avatar
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    Re: Water turned slightly green...unusual.

    Just a guess, but the effective chlorine level at 4ppm FC and 0ppm CYA is much higher than what you might typically see in normal operation. Maybe some iron from water lines has ended up in your pool and oxidized when you added the chlorine. When this happens, the water isn't actually green, but yellow, and yellow water against a blue liner looks green.

    Not certain at all, but it might explain it. Do you live outside or on the edge of a city where your water lines may not get flushed well from other users beyond you?
    TFP Moderator
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    Patrick_B's Avatar
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    Re: Water turned slightly green...unusual.

    Personally, I have seen this very thing happen to a Lady's pool I helped with. She called a couple of hours after we added Chlorine and we determined later it was Iron. Fresh fill in a large pool with City water and it made sense after we thought about it. Old town, and they were constantly having water delivery system issues because of dilapidated piping. It can happen even in much better systems I am sure.
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    JoyfulNoise's Avatar
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    Re: Water turned slightly green...unusual.

    If it's still there put some pillow stuffing material (local craft store should have it) in the skimmer basket and see if you can filter it out. If you get a brownish-red stain on the stuffing material, it's iron. A little tablespoon or two of cal-hypo powder sprinkled on top will locally jack up the pH and FC inside the skimmer and make the metals precipitate faster. Think if it as a little Myth Busters science experiment you can do.


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    borjis's Avatar
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    Re: Water turned slightly green...unusual.

    Thanks for the options.

    I was puzzled most by the fact I did a fresh fill just over a year ago and never saw it before, but the more
    reading I've done, it truly is leaning towards a metals issue. The water out here is pretty darn good so
    I'm confused how this could have happened. The neighborhood was built in the late 60's / early 70's.
    The water plant is about 3 miles away, but I'm also way in town and not on any outskirts.

    I looked into the lamotte metals test kit but it's kinda spendy at $ 75.

    Where I live now the water is cheap. It cost me $ 20 to fill my pool up when the liner was replaced.

    I think my plan for now, will be to drain half and refill and see how it goes from there since that will
    be the least cost option. And I want to take care of it quick before any possible staining happens.

    I might try that pillow stuffing before I replace some water just to see what it shows. And yes
    it could actually be yellow but showing as green with the blue liner...makes sense.

    I had iron staining at my last house/pool and that wasn't any kind of fun.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
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    JoyfulNoise's Avatar
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    Re: Water turned slightly green...unusual.

    Can you vacuum to waste?

    I know we don't like to push this approach but an alum based flocculant will cause metals to drop out of solution. Polyaluminum chloride flocs do this too. If you can vacuum to waste, you then remove the flocc'ed metal laden water at the bottom and refill. It will use less water to do it that way.

    Up to you.


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    borjis's Avatar
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    Re: Water turned slightly green...unusual.

    I could, but I'd probably do that as a last resort if I have to.

    thanks for the suggestion Matt
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
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    Re: Water turned slightly green...unusual.

    If you are keeping FC in your pool, you should have CYA (30 ppm) in there as well.

    Lower your pH down to 7.0 or 7.2.........that may clear the green immediately or speed up the process a lot. If it's not bugging you, I'd just let the filter run 24/7 until it is filtered out....may take a few days.
    Dave S.
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    borjis's Avatar
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    Re: Water turned slightly green...unusual.

    Thanks Dave,

    I ran out of cya granules but have more on the way arriving this weekend.

    Wouldn't a ph lower than 7.2 harm my new heater heat exchanger though?
    or just as long as it isn't there for weeks on end?

    Unfortunately there is no heater bypass plumbed in.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
    Dolphin E10 Cleaning Robot.

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    JoyfulNoise's Avatar
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    Re: Water turned slightly green...unusual.

    Quote Originally Posted by borjis View Post
    I could, but I'd probably do that as a last resort if I have to.

    thanks for the suggestion Matt
    That's fine. Whatever works for you...
    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: Water turned slightly green...unusual.

    I know we don't like to push this approach but an alum based flocculant will cause metals to drop out of solution.
    If you try this as a last resort, the cheapest and best date is specifically Leslie's brand of pure alum floc at about $25 a tub. Follow the direction precisely, especially re ph if you go this route, and only if you can vac to waste (and have a sand filter, which I see you do.)

    Personally, I would do this BEFORE trying any metal sequestrants...because even if it only partially works and even if your municipality is cheating out on its own sequestrant, you will dramatically lower a Jacks or Metal Magic habit, each which cost roughly the same as the tub of floc
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  13. Back To Top    #13
    JoyfulNoise's Avatar
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    Re: Water turned slightly green...unusual.

    Just confused - do you have an autofill or has the pool been filled recently with muni water?


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    borjis's Avatar
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    Re: Water turned slightly green...unusual.

    No autofill, but the record breaking heavy rains and draining to proper level past few months has wiped out my cya completely. (did last year too, and the previous owner used a puck chlorinator...maybe not such a bad idea hehe)

    And that also makes it more puzzling. Rain and snow this season has probably replaced close to 1/4 of my water since August.


    It was fresh filled for the first/only time in october 2015 when the the new liner was installed.
    The entire first season went very well. No weird issues.

    I'll probably just replace the water..it will only set me back $ 20. easy to do.
    Doing the floc makes me nervous. I won't do that unless its absolutely necessary / don't want to make
    things worse.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
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    borjis's Avatar
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    Re: Water turned slightly green...unusual.

    I drained and replaced 1/4 of my water, there was still a slight hint of green when I checked it the next day so
    I replaced another 1/4 bringing it to a 50% water change out.

    All the green is gone. And after adding chlorine it did not turn green, so its safe to say my city fill water doesn't
    have a high concentration of metals.

    Still puzzled how this happened at all but thankful it's cleared up now.
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
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    JoyfulNoise's Avatar
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    Re: Water turned slightly green...unusual.

    Too bad you didn't save some in a bucket. You could tested some floc on it.


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

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    Re: Water turned slightly green...unusual.

    You know how we say every pool is different? Some a just a bit differenter than others.
    Bob - INTEX 12x24 owner (not setup yet), 'New to me' Kreepy Krauly Sand Shark, Test kit: TF-100 w/Speed Stir

  18. Back To Top    #18
    JoyfulNoise's Avatar
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    Re: Water turned slightly green...unusual.

    And it will be St Patrick's day on Friday so maybe the pool was just trying to be festive?!?

    Way to go ruining the pools mood, dude....


    Matt
    16k IG PebbleTec pool, 650gal spa, spillway and waterfall, 3HP IntelliFlo VS / 1.5HP WhisperFlo, Pentair QuadDE-100 filter, IC40 SWCG, MasterTemp 400k BTU/hr NG heater, KreepyKrauly suction-side cleaner Dolphin S300i robot, EasyTouch controls, city water, K-1001, K-2006 and K-1766 test kits, Mannitol test for borates

  19. Back To Top    #19
    borjis's Avatar
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    Re: Water turned slightly green...unusual.

    oh dang! that HAD to be it! haha
    16x32 IG Vinyl, 13,000 Gals. Hayward S-244T sand filter, SP2810X15 pump
    (1.5 HP motor) Raypak PR266AEN (266k btu) gas heater. TF-100 Test Kit.
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