brown algae or sand on the bottom of my above ground

Algae problems in swimming pool water.
Green (cloudy) water or slimy pool walls.
Black algae. Mustard algae. Pink or white pool mold.
Guest

brown algae or sand on the bottom of my above ground

Postby Guest » Sat 22 Sep, 2007 12:55

I have brown algae or sand on the bottom of my above ground. I'm not sure what it is. The pool water tests ok. I've shocked it several times. When I vacuum it, the water turns cloudy and then several hours later, as the cloudiness subsides, it settles to the bottom again. I'd say about 20% of the pool bottom has this substance on it. Does anyone have any idea what this stuff might be and how to get rid of it.


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mr_clean
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brown algae or sand on the bottom of my above ground

Postby mr_clean » Sat 22 Sep, 2007 14:31

Have you brushed it at all?
If it is sand it will not go away and just move around and stay on bottom of the pool. If it's algae it will disolve into water.
If you are getting sand in the pool there may be a lateral broken in the bottom of the filter.
Guest

Postby Guest » Sat 22 Sep, 2007 17:29

I haven't brushed it. It dissolves into the water as soon as the vacuum gets near it. I'm not using a sand filter. If it's algae, what's the best way to get rid of it?
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mr_clean
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Location: So Cal

brown algae or sand on the bottom of my above ground

Postby mr_clean » Sat 22 Sep, 2007 23:18

This sounds like it could be dirt/dust, what type of filter do you have DE or catridge?
If cartridge, soak filter in good filter cleaner and once installed add a little DE powder to help catch.
If DE, clean and inspect inside filter.
Can you give a full set of chemical readings?
Guest

brown algae or sand on the bottom of my above ground

Postby Guest » Sun 23 Sep, 2007 09:44

The algae looks like a brownish gray today. I backflushed the filter 6 weeks ago and added 4 scoops of D.E. to it.

ph: 7.4 ppm
free chlorine: 10 ppm (recently shocked)
total alkalinity: 130 ppm
stabilizer: 140 ppm
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mr_clean
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Location: So Cal

brown algae or sand on the bottom of my above ground

Postby mr_clean » Sun 23 Sep, 2007 10:12

The algae looks like a brownish gray today. I backflushed the filter 6 weeks ago and added 4 scoops of D.E. to it.

ph: 7.4 ppm
free chlorine: 10 ppm (recently shocked)
total alkalinity: 130 ppm
stabilizer: 140 ppm


Do you float chlorine tabs? your CYA/stabilizer level is to high and tabs have this in them. You should drain some water from pool to lower CYA retest and run between 60-80ppm. When CYA gets over 100ppm it will make chlorine less effective.

Once CYA is lowered you need to shock pool and have chlorine level above 20ppm until problem is gone. You would need to check chemicals 2-3 times a day so chlorine does not drop and add liquid chlorine to keep it there.

Whens the last time you pulled DE filter apart and cleaned & inspected everything?
I have seen DE filters get algae inside them and without cleaning them algae will not go away. Backwashing would not fix problem, if you had a bad algae outbreak before.
cleaning your DE filter once a year will help make filter/parts last longer
Guest

Postby Guest » Sun 23 Sep, 2007 20:19

Thanks for the advice. I clean the filter and soak it in muriatic acid for a day after every season.
ml2424sh

Sand at the bottom of my pool

Postby ml2424sh » Fri 03 Oct, 2008 14:54

I have sand at the bottom of my pool...everytime i try to vaccume it it just rattles around and then settles to the bottom...What do i need to do to remove the sand so i can winterize the pool???
given up

brown algae

Postby given up » Mon 17 Nov, 2008 05:34

I have been to my pool shop for the last 2 years about this problem. They told me I needed a new top for my sand filter. Done that do different. Check pipes have no cracks or leaks, done that. Have vacuumed on waste and had gel block in skimmer box, no different. I thought it was sand coming back into pool, now have been told it is probably brown algae. I don't think you can get rid of this it's a pain in the ass. Let me know if you think any one can solve this problem, thanks.
chem geek
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brown algae

Postby chem geek » Mon 17 Nov, 2008 06:02

If it's yellow/mustard algae (which is probably what they are calling brown algae), then it is more resistant to chlorine but it CAN be killed and even kept away with chlorine alone, assuming the Free Chlorine (FC) level is maintained sufficiently relative to the Cyanuric Acid (CYA) level. You can read more about the chlorine/CYA relationship at the Pool School.

I suggest you start off by getting a good test kit -- either the Taylor K-2006 kit you can get at a good online price here or the TF100 test kit from tftestkits(dot)com here with the latter kit having 36% more volume of reagents so is comparably priced "per test".

Richard

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