Another new pool owner and BBB convert

[PoolDoc]

On outdoor pools, 'shocking' is usually not needed *if* you
(a) you maintain Best Guess chlorine levels,
(b) expose the pool to sunlight regularly (chlorine + solar UV break down contaminants chlorine alone has a problem with) and
(c) are not having a problem with algae or whatever.

Membership updated.

[ccs717]

Thanks Watermom & PoolDoc! I have read all(?) the material over at the Pool Solutions site. Again, great info!

One other question for now: The vinyl liner, right above the water line, is rather dark gray and dingy. Using a brush or plain sponge on it has no effect. Is there a best practice for how to clean that? Any such thing as a "pool water safe" cleaner? Or do I just leave it alone?

[PoolDoc]

You can use baking soda on a sponge; that works well for removing some forms of black water line grunge. But sometimes, the 'stain' is actually deterioration of the liner, which can't really be 'removed'.