The frequency of cleaning or replacing filter foams depends on several factors, including the number of fish, their waste production, seasonal changes, and general pond or aquarium conditions. Here's a guide to help you:

• Cleaning Frequency: Many aquarium and pond keepers choose to rinse their filter foams during regular water changes. Others might wait 2-3 weeks and clean the sponges only when necessary. Pond owners often check and rinse their sponges weekly as part of general equipment maintenance.

• Water Used for Cleaning: Always rinse your filter sponges in pond or aquarium water, never in tap water. Using tap water can kill beneficial bacteria essential for filtration and may result in having to cycle the water again.

• Replacing Filter Media: Replace your filter media only when necessary. If the media looks excessively dirty, damaged, or if you notice a drop in filter performance, it’s time to replace it.

Keep an eye on your filter’s condition and adapt your cleaning schedule accordingly to ensure optimal performance without disturbing the beneficial bacteria.