"Elmo" wrote in message
...
I have two questions about pools.

1. About six to ten inches of mortar are missing from the top corner of an
edge of the tiles at the top of the pool. These tiles get wet but this
particular edge is about two inches above the water line.

What grout (mortar?) is used for edges where horizontal tiles meet
vertical
tiles near water?

2. I have green spots that seem to be spreading on the walls of the
gunnite
pool, in the deeper areas. The water chemistry, as checked by Leslie's
Pool
Supply, seems ok (they said the chlorine is perfect, the pH is perfect,
the
Calcium is fine, the total dissolved solids are very low, and the
Phosphates are a tad on the high side.

I assume it's algae (but how would I know)? I shock with three pounds of
chlorine (35,000 gallon pool) about once every two or three weeks.

I've been scrubbing the green growth off but is there an easier way to
identify and then remove whatever it is that is causing green growth in
tiny spots (about the size of a pencil width) on the gunnite walls?

I fought those, then bought this thing that looks like one of those pencil
erasers you would slide over your regular pencil eraser. You put it on the
end of a pole, or you swim down and rub the spots. It worked pretty good.
It's sacrificial, it is like rubbery, and it rubs off the eraser before it
eats off the concrete. Algae is easier to prevent than cure. At times, I
have taken the power washer hose in there BUT YOU HAVE TO BE CAREFUL AND NOT
BLOW THE CONCRETE AWAY.

Steve

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