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Thread: What plaster looks like 2 years later

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    What plaster looks like 2 years later

    We had our pool replastered in January of 2015. We have kept up the pool chemicals and have been good about brushing. Never had an algae outbreak. We do have very hard water with the calcium hardness rising fast with no real reason (we have been around about that on the forum with no answers as to why except the hard water) so we did a reverse osmosis last summer but it is hovering about 500 now not even a year later. Even with all the time we devote to the pool our plaster has developed some slight yellow staining after only a few years. I can see it probably won't be much longer before it looks as bad as it did before we replastered. Is this inevitable? Can anyone keep their plaster white (or whiteish) and for how long realistically? It is very discouraging. My friend in another state had hers replastered about a year before mine, I visited last weekend and it has some black flecks but still looks overall quite white. She doesn't have hard water issues. So, how long realistically before plaster develops stains even with good care?
    17,000 gallon inground pool; Plaster redone January 2015; Pentair Cartridge Filter; SWG; Age of pool unknown (house built in 1973); Taylor K-2006 Test Kit.; Doheny Discovery robot cleaner.

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    Mod Squad jblizzle's Avatar
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    Re: What plaster looks like 2 years later

    You should never get staining. The CH goes up due to evaporation and adding water back into the pool. What is your water source? Does it come from a well? Could the stains be the beginning of metal staining?
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    Re: What plaster looks like 2 years later

    I filter my fill water with an inline hose filter.
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    Re: What plaster looks like 2 years later

    Thanks for the replys. I guess maybe "staining" isn't the right word. Our plaster never looked pristine white from the beginning (it was creamy with creamy swirls) so maybe my expectations are too high. There have never been any metals detected in the water when we have tested for it. We are on city water. There is just a slight yellowing. Probably only 1/2 on a scale of 1 to 5. Nobody would notice unless the water was still and you were looking. I am just curious if anyone with plaster really has the same white after several years as when it was first done.
    17,000 gallon inground pool; Plaster redone January 2015; Pentair Cartridge Filter; SWG; Age of pool unknown (house built in 1973); Taylor K-2006 Test Kit.; Doheny Discovery robot cleaner.

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    Re: What plaster looks like 2 years later

    we have been around about that on the forum with no answers as to why except the hard water
    That is the answer. You have hard water and must make compensation for it by testing, managing and occasional refills. There is no mystery.

    What is the CH of your fill water?
    Dave S.
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    JoyfulNoise's Avatar
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    Re: What plaster looks like 2 years later

    In a plaster pool, water balance is not all about CH but it is an important factor. A plaster pool must have a balanced chemistry where pH, TA and CH are ALL important numbers. These numbers, along with temperature, salt, and borates, get combined together to calculate the calcite saturation index (CSI). If the CSI is kept in balance (-0.3 to +0.3), then you will not have a problem with calcium scaling.

    Can you please post a FULL set of pool water test results AND your fill water pH, TA, CH values?

    Also, a picture of the "Stains" would help.

    As a point of reference - my pool currently has a CH of 1100ppm and yet I have no issues with scaling because I manage my CSI accordingly. Absolute CH values are somewhat meaningless without knowing pH and TA values as well.
    Matt
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    Re: What plaster looks like 2 years later

    My results from last weekend were:
    PH 7.8
    TA 70
    FC 4
    CC 0
    CYA 50
    CH 500
    Salt 3600
    Temp 77

    I measured the fill water for CH a few times before we did the Reverse Osmosis on it last year and CH was 100. It is really windy today so I will try to snap some photos of the yellowing in the plaster tomorrow and post. Any insight into what I might be doing to contribute to the yellowing is appreciated!
    17,000 gallon inground pool; Plaster redone January 2015; Pentair Cartridge Filter; SWG; Age of pool unknown (house built in 1973); Taylor K-2006 Test Kit.; Doheny Discovery robot cleaner.

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    JoyfulNoise's Avatar
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    Re: What plaster looks like 2 years later

    Those numbers are fine. Your pH can vary anywhere from 7.4 to 8.0 ?(if your TA stays below 80ppm) and your CSI will still be in the correct range. Your fill water has really low calcium for a desert climate.

    Just a couple of more questions (please excuse them if they seem obvious)-

    1. Do you use a water softener? If so, is you pool plumbed to be filled with softened water? Just trying to make sure your source water for the pool is actually the water that reads a CH of 100ppm.

    2. What is you frequency of acid additions? Is your pH relatively stable or do you find yourself fighting high pH? When do you add acid (at what pH) and how low in pH are you targeting when you do add acid? Also, are you using liquid muriatic acid as opposed to dry bisulfate acid? (The correct answer is, I always use muriatic acid and would never touch the dry granular acid...)

    There are two other tests you can quickly do to test the yellowing plaster. First, fill a sock with crushed up vitamin C tablets (you might have some in your medicine cabinet or you can buy some at the supermarket) and push the sock down by an area that has a good sized yellow stain. Leave it there for 15mins or so and then pull it up. Did the stain lighten at all?

    Next, add some dichlor shock powder to a sock or get a 3" trichlor puck and rest it on the stained area for 5 mins (no longer). Did the stain lighten at all?
    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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    Patrick_B's Avatar
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    Re: What plaster looks like 2 years later

    That should be very easy water to manage, so whenever you can get the weather to cooperate, it will be nice to see the pics. If your numbers look much like that with regularity, you should have very few if any issues. I'm up there with Matt, now knocking on the door with nearly 1000 CH. Oh how I wish for 100 makeup CH.
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