I am a plumbing contractor in tampa. fl. I finished a house 6 months ago.
The homeowner had culligan install a water softener when she moved in. This
is a large house and I have installed a hot water recirculation system. I
have been out 5 times to rebuild the pump which keeps the hot water
recirculating. Each time there is green sludge in the pump. I have
installed a basic filter inline before the pump and in a month's time it
fills with this sludge and still gets through and damgages the pump. Now I
have done 25 or more houses in this area with recirc systems in them and
have never had a problem. The culligan rep told me this is caused by the
polyphosphates in the water?? A couple of other people have mentioned a
possible algae bloom in the water system of this house?? I believe this is
a water softener problem only because of the track record of all the houses
I have done with no problem.
Last year I was called out to a house with a similar problem. The homeowner
had a Kinetico system installed 1 1/2 years after they moved in and within 2
months they had this green slime. I rebuilt the pump twice for them over
the period of 4 months and installed a filter and never heard another word
Any suggestions/help would be greatly appreciated.
Do a water test for copper. New copper tubing takes some time to corrode
enough to protect itself from aggressive water; if it ever does which is
unlikely. I don't think the softener has anything to do with the
problem, I've sold them for 15 years without this complaint. It's
probably more likely low pH (acidic water) or the velocity of the water
in the recirc loop (could it be no reaming of the tubing or flux
corrosion?) and erosion if you see elevated levels of copper. Once you
have the copper test result, both before and after the softener, come
back here or e-mail me and we'll discuss other potential causes. If you
don't find elevated copper, I don't have any idea other than bacteria
that would cause a slime, regardless of the color but green goes along
with copper. Polyphosphates aren't normally added to 'city' water around
here, so I'm not sure they would be there in FL but something else could
Quality Water Associates
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