SUNSUN CHJ-502/602/902/1502 Spare wool replacement (2PCS/pkt)

SUNSUN CHJ-502 Spare wool replacement (2PCS/pkt)
SUNSUN CHJ-602 Spare wool replacement (2PCS/pkt)
SUNSUN CHJ-902 Spare wool replacement (2PCS/pkt)
SUNSUN CHJ-1502 Spare wool replacement (2PCS/pkt)

SUNSUN CHJ spare filter wool for 502, 602, 902 and 1502 internals

These two-piece wool replacements fit the SUNSUN CHJ-502, 602, 902 and 1502 internal filters, and keeping a spare pack on hand is one of the cheapest ways to maintain steady flow. Filter wool is mechanical media: it traps fine debris and the suspended particles our warm 27-29C tanks produce as fish are fed and plants shed. Once it clogs, flow drops and the rest of the filter works harder, so timely swaps keep the whole unit efficient.

We recommend rinsing wool in old tank water rather than fresh tap, since Singapore’s chloraminated supply can knock back the beneficial bacteria living in it. Replace the wool only when it is genuinely matted and no longer cleans up with a rinse, and stagger it from your biological media so you never reset both colonies at once. That simple rhythm keeps cycled tanks stable through routine maintenance.

Find more in our filter media category. To get the layering right, read our filter media guide and our media order guide for the correct flow sequence.