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If you fill your pool with well water, you’ll need to add a metal remover.

FILTERS When cleaning cartridge filters, soak them in a cleaning solution for 24 hours, then hose them off before reinstalling.

D.E. filters should be disassembled and cleaned at least once per season. Is your sand filter 3-5 years old?

If so, ask your pool professional if it’s time to replace the sand. If your filter pressure gauge indicates that pressure has dropped below the normal reading for a clean filter, check to see if you have a clogged pump or skimmer basket. CLOSING KIT Cleaning your sand or D.E. filters when you close your pool for the season will ensure that they are ready for action when you open your pool the following summer.

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Source: (pool filters maintenance) http://ezinearticles.com/?Pool-Equipment-Maintenance&id=1408131