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Thread: Interesting residue on pool stairs...

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    Join Date
    Jun 2014
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    Morristown, NJ
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    Interesting residue on pool stairs...

    pool.jpg

    I am somewhat new to pool ownership...
    Last year was my first year with the pool and had help from a neighbor who has his own pool learning the ins and outs...and of course learned a lot reading TFP!

    So last year the fiberglass pool stairs (2 sets) were a yellowish color. Neighbor said it just happens over time due to the chlorine as the pool is about 8 years old. It could not be scrubbed off, even when I scrubbed it with a slightly abrasive brush. It was similar in the yellowing of return jets over time. We closed the pool for winter and when we opened it and got it all cleared up and ready to go this year...the stairs were white as can be! Pleased and shocked! Not sure what would explain this...any ideas?

    My real question is related to the slight yellowing again this year. Every now and then there is a buildup of fine dirt that lays on the stairs as there is a lot of landscaping around the pool. I simply vacuum it or brush it off with a pool brush and it clears up. The yellowing this time would not come off with a pool brush...however if I rub my fingers across it I come up with a whitish residue as seen in the picture. Though it looks yellow on the steps...it comes out looking whiter.

    I panicked thinking mustard algae and ran to the local pool store and they thought it was a calcium building up...or pollen...however it is only on the fiberglass portions of the pool. They said if it was algae it wouldn't stick to my fingers like that. Water is crystal clear...and nothing is floating around on the surface. Rubbing my hand on many different spots of the liner does not produce this residue. I do not think it feels slimy. My wife says she thinks it may possibly be a little slimy but I will hold to my opinion. Here are my water readings taken at the same time as the picture.

    PH: 7.7
    FC: 2.75
    TC:2.75
    CYA: 85
    TA: 110
    Hardness: 110

    Any ideas what could be causing this residue buildup? Having a BBQ this Saturday...can I be sure it isn't algae? Thanks!
    25k gallon vinyl liner, DE filter, Hayward 1.5HP super pump, waterfall, frog system, gas heater

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    Mod Squad woodyp's Avatar
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    Re: Interesting residue on pool stairs...

    I don't know that what you are looking at is so much of a "buildup" as it is just plain old "chalking" of the fiberglass due to sun and age. Just like a boat finish.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
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  3. Back To Top    #3

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    Re: Interesting residue on pool stairs...

    It seems to be something on the surface of the stairs because when I wipe it away the stairs go back to being white and the integrity of the pebbled pattern on the stairs is retained. There doesn't appear to be any wear of the stairs.
    25k gallon vinyl liner, DE filter, Hayward 1.5HP super pump, waterfall, frog system, gas heater

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    smforte's Avatar
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    Sep 2013
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    Re: Interesting residue on pool stairs...

    Iron? Happened to mine and I had iron stains. Try a vitamin c pill on stain. See if stain disappears. How do you chlorinate your pool? Also your FC is low for your CYA
    Montgomery, AL
    27000 16 x 36 IG, Vinyl, Grecian, Hayward Sand filter, 1 HP Pentair whisperflo motor, Aqua Genie filter not by choice, no extra jets, Dolphin s300i robotic cleaner,Taylor K 2006 test kit, speed-stir which I couldn't live without!

  5. Back To Top    #5

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    Re: Interesting residue on pool stairs...

    It just wipes off with my finger...that's what threw me off. I thought iron would have needed a vitamin c treatment.

    I have a frog system for my pool. And the culprit of the steady rise in my CYA.
    25k gallon vinyl liner, DE filter, Hayward 1.5HP super pump, waterfall, frog system, gas heater

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    Administrator Leebo's Avatar
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    Re: Interesting residue on pool stairs...

    I agree with Woody here. How old are the stairs? My guess say's they're rather old???

  7. Back To Top    #7

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    Re: Interesting residue on pool stairs...

    The pool was installed by previous owners about 7-8 years ago. The chalking will look yellowish?
    25k gallon vinyl liner, DE filter, Hayward 1.5HP super pump, waterfall, frog system, gas heater

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