Do NOT scrub it -- you will damage your liner.
Sounds like sand algae residue. Take a look: http://www.poolforum.com/pf2/showthr...111-Sand-Algae
It you can confirm that it is sand algae, you need to read this page:
http://www.poolsolutions.com/gd/lowe...p-by-step.html
and this thread:
http://www.poolforum.com/pf2/showthr...atment-Process
To fix the problem, you'll need:
1. A K2006 kit
2. A calcium bucket test result
3. Use the results of #2 to "lime soften" your pool, THEN
4. Use alkalinity page to lower your TA to less than 60 ppm.
THEN, you'll be able to re-dissolve the calcium deposits on the liner.
Bookmarks