After an acid wash, the surface of the pool is very rough.
What should I do to smooth it out?
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Traditionally: Slap on a fresh coat of pool paint and let that provide the smooth surface.
(I grew up with a concrete-and-plaster pool. Our ad-hoc experience was that removing as much muck as possible from the bottom, shock-treating the heck out of it, starting the filter and getting the chemistry rebalanced seemed to be effective enough that we could skip the empty/acid-wash/refill cycle some years. I'd appreciate commentary from someone who understands the chemistry of the paint and plaster well enough to tell us just how unreasonable this was.)