What are the common signs that indicate a pool filter needs to be cleaned or replaced, and how do different types of filters (sand, cartridge, diatomaceous earth) affect maintenance schedules?

What are the common signs that indicate a pool filter needs to be cleaned or replaced, and how do different types of filters (sand, cartridge, diatomaceous earth) affect maintenance schedules?
Admin 3 days, 18 hours ago in Pool servicing and maintenance
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