I have a Gunite pool in CT. I have had the pool for three years and
this is the first year that I had algae growing on the walls (just
below the tile). I have never had this problem and have never used
This year its a problem.
I was wondering if others have noticed excessive aglae this year or
could it be due to the fact that this year I started using a
non-chlorine shock? I always used a chlorine shock until this year.
I'm interested to hear what others have to say.
> I have a Gunite pool in CT. I have had the pool for
> three years and this is the first year that I had algae
> growing on the walls (just below the tile). I have
> never had this problem and have never used any
> This year its a problem.
> I was wondering if others have noticed excessive aglae
> this year or could it be due to the fact that this year
> I started using a non-chlorine shock? I always used a
> chlorine shock until this year.
> I'm interested to hear what others have to say.
I don't believe that the non-chlorine shocks kill algae.
They supposedly burn up organic wastes, but I don't think
algae are affected.
Other things you might also check:
1. Stabilizer level. If it gets too high, your regular
chlorine will become less effective.
2. Phosphate levels. These compounds are not burned up by
normal chlorination or super-chlorination, but there are
specific products which remove them.
I've never used algecides. I don't think they are necessary
if everything else is right.
We've had a very wet spring and summer. When brushing, an often over
looked area is behind the under water light's rim, the bottom last spa step,
and behind the thru-the-wall skimmer. Dead algae encapsulates and
protects new algae, so a good brushing is needed. Use rope to get behind
the water light rim and work the rope back and forth. Non-chlorine shock
is a very strong oxidizer but a good chlorine residual is needed too.
Chlorine can be thought of as a poison to algae and bacteria. If you had
a ozone generator the ozone would actually infiltrate the nucleus and
the membrane. Something to think about.
You didn't ask but here's something else to consider. Ozone and chlorine
can eliminate e coli. much faster than chlorine alone. I don't want to sound
gross but reality is kids and maybe some adults aren't very clean down
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