On Jul 16, 10:26*pm, Elmo dcdraftwo...@Use-Author-Supplied-
Address.invalid wrote:

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

For something that small I'd use a marine sealant (caulk). Back in
the olden days we just used a sanded grout, but today there are expoxy
grouts that are probably better.


2. I have green spots that seem to be spreading on the walls of the gunnite
pool, in the deeper areas.
Phosphates are a tad on the high side.

There's your problem. Phosphates are algae food. You need a
phosphate eliminator like Phosfree. Comes with phosphate test kit.

I shock with three pounds of
chlorine (35,000 gallon pool) about once every two or three weeks.

I shock my 20K gallon pool every week (2#), but our dog spends more
time in the pool than anyone.

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?

Automatic pool cleaner, but I'd recommend not a Kreepy Krawly.

I'm no pool expert but I think you probably ought to learn to do your
water chemistry yourself. Only takes a few minutes a day.
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- gpsman