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  1. C

    New stain on pool liner

    No oak trees. I know nothing about iron in the water, but will get some ascorbic acid. Thanks again.
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    New stain on pool liner

    No fertilizer, but good thought. I did use lime on the lawn 2 days ago, so the timing fits. But it was deployed on the opposite side of the pool... Could lime - CaO - do this?
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    New stain on pool liner

    Yes! Helpful as always, mknaus!
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    IMG_0229.jpeg

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    New stain on pool liner

    Uh, the jpeg doesn't seem to attach. Do I need to use a different file format? I tried a PNG, but it was too large for the server to handle.
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    New stain on pool liner

    Hello everyone. A new problem, noticed only today after several days of leaving the solar cover off. 20 or more of these black, comet-shaped marks, ranging from an inch to 4-5 inches in size, in one corner of the poll's shallow end. They do not vacuum off, and they do not brush away! Please...
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    The wrong diatomaceous earth

    Many good points in that article, but most timely is that I should wait until the pool water is below 60°F. Thanks again, mknauss.
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    The wrong diatomaceous earth

    Ah, Fall. The solar panels by mid-August no longer contribute to the pool temperature, which has now been stuck at 19°C (66°F) for several days. Brrr... The pool water has remained largely clear recently. There was a spate of cool and/or rainy days in late August when the solar cover was not...
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    The wrong diatomaceous earth

    You folks are helpful, and a re-read of my last note makes me appear less than appreciative. Sorry if the tone seemed negative; it wasn't intended that way. I do get confused easily, and disheartened when all my efforts seem futile. I decided that Recirculate mode means circulate without...
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    The wrong diatomaceous earth

    Tivo: yes, I do know the 3 rules for stopping the SLAM. I won't bore you with details as to why I stopped the SLAM while the water was still cloudy. I wasn't aware of the concept that cloudiness breeds algae growth. JoyfulNoise, the idea of wasting pool water is abhorrent to me, and yet I do...
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    The wrong diatomaceous earth

    Tivo, the SLAM has already done its job, insofar as the green deposits are concerned. Since the fiber supplement for my constipated filter isn't due for a week, I guess I will be SLAMming for another week anyway!
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    The wrong diatomaceous earth

    Quandary: whether it makes sense to stop the pump for even a few hours in the midst of a SLAM. I did stop it overnight, and there was some settling. I vacuumed to waste. Didn't seem to make much difference. I suppose I would need to do this repeatedly.
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    The wrong diatomaceous earth

    Thanks both of you, for the edification! I could not fathom why algae would occur, when FC is 7 or higher. The "Fiber Magic Filter Aid" is due in a week. Hopefully that's the answer to our woes.
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    The wrong diatomaceous earth

    Is there a connection between the unresolved cloudiness issue and the recurring algae? It seems the TFP routines were working well for us, until I screwed up by adding the wrong DE to the sand filter. SLAM x3 in the span of a month seems like it should have been unnecessary.
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    The wrong diatomaceous earth

    Groan! Despite a FC reading of 7 (2 days ago and again today, whilst coming down from the most recent SLAM) we have green algae in the pool. This happened while the summer cover was in place for 2 rainy days, following several weeks of sunshine and heat. As well we have the cloudiness described...
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    The wrong diatomaceous earth

    I did turn off the pump overnight. There was minimal settling. I did not vacuum to waste, but instead ordered the cellulose-based product from Amazon, as per previous advice. "Fiber Magic Filter Aid", since "Fibre Clear" does not ship to Canada.
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    The wrong diatomaceous earth

    FC 12 - I just decided to SLAM after a small amount of green algae showed up, now gone. CC 0. pH 7.5, TA 60, CYA 30. Temp 24°C, 75°F.
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    The wrong diatomaceous earth

    But the issue is that the pool water is still cloudy, after filtering as usual, 24/7, for weeks. I need something that will filter out the fine particles of Garden Variety DE, or whatever it is that is still suspended. And then decide if I need to replace the sand in the filter. I have ordered...
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    The wrong diatomaceous earth

    It was about 1/2 cup of garden-variety DE. Thanks for the advice about Fiber Clear; that's very useful. Does it go in through the skimmer, like DE? And then get washed away in the backwashing?
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    The wrong diatomaceous earth

    WHOA! Cellulose fiber replacement? Just when I thought TFP had given me some understanding of what I'm doing... and changing my sand? I guess it's time to call the pool shop again. Call a friend? I don't even know someone else who has a pool!
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    The wrong diatomaceous earth

    Out of desperation, due to cloudy pool water and inability to find "heat treated" or "pool grade" DE, I used the garden variety DE. And now, of course, it seems the pool is never going to clear. Is pool grade DE the answer? Now I see an online source for the pool grade DE, but it's in a 50 pound...
  22. C

    Bleach vs Chlorinating Liquid

    Okay thanks. Good to know.
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    Bleach vs Chlorinating Liquid

    Finally getting around to the SLAM, having put it off for 2 weeks due to being away from home. I thought that I had read last time I SLAMmed, that one should leave the summer cover off the pool until the SLAM is complete. Upon re-reading the SLAM procedure, it appears that I'm mistaken. Any...
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    Bleach vs Chlorinating Liquid

    :) Thanks for the quick and helpful reply.
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    Bleach vs Chlorinating Liquid

    Thanks MK. The 200gm CYA was added via a sock in the skimmer, and dissolved over the past 3 days. I was purposely keeping the dose low, having been warned about overshooting with CYA. I had also placed 5 or 6 pucks in a puck caddy, so concerned I was about the FC level dropping during our 3 days...
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    Bleach vs Chlorinating Liquid

    Okay thanks folks. I'll stick with the "Chlorinating Liquid". One of the reasons I asked the question is that I was wondering if Bleach is somewhat more effective than Chlorinating Liquid. Apparently not, but we have an issue right now with patchy fine algae on the floor of the otherwise...
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    Bleach vs Chlorinating Liquid

    Hi all, Such a great forum. I found the answer to my first question in an old thread: Chlorinating liquid 10.3% is pretty much the same as Concentrated Bleach 8.25%, but 25% stronger. Should have been obvious, maybe. A recent missive from TFP cautioned against using Bleach with Chloromax. May...
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    Draining the pool cover

    The answer to my question eventually revealed itself. Once I was able to remove most of the "fine sediment" at the bottom of the lake on top of my winter cover, the cover did rise to lie flat again. I underestimated how much effect a thin layer of sediment can have.
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    Draining the pool cover

    Thanks! The tarp is plastic, so it doesn't get "saturated" according to what I understand that word to mean. The water on top is pretty clean so far, but I will keep in mind what you say about adding a little bleach. I get what you mean by "still in the pool". Worse case, when time comes to...