Pool filters come in three main types: sand filters (low maintenance, 5-7 year lifespan), cartridge filters (easy cleaning, 1-2 year replacement), and DE filters (finest filtration, requires backwashing every 4-6 weeks).
Pool algaecides should not be used in ponds as they contain chemicals toxic to fish, plants, and beneficial bacteria. Use pond-specific treatments or natural methods instead.
Yes, you absolutely need pool chemicals even with a sand filter. Sand filters only remove physical debris and particles - they cannot sanitize water or balance pH, alkalinity, and other chemical levels required for safe swimming.
Pool alkalinity typically rises due to fresh fill water with high alkalinity, adding pH increasers or certain sanitizers, excessive aeration from water features, and natural processes like algae growth.
