Aquarium Pre-Filter – 4-Piece Set for 604 Canister Filters
Four-piece aquarium pre-filter set with sponges and cartridges for EW-604 and HW-604 external canister filters. Replacement parts supplied as a kit.
Original price was: $132.00.$68.00Current price is: $68.00.
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Aquarium Pre-Filter – 4-Piece Set for 604 Canister Filters
Canister filters lose flow long before they stop running — the sponges clog, the pump strains, and the water that should be polished starts looking cloudy. This aquarium pre-filter kit supplies the four pieces that get replaced together: sponges and cartridges sized for the EW-604 and HW-604 external canister range. Keeping spares means you can swap a clogged stage instead of buying a whole new filter.
Why fish keepers choose it
- ✔ Four pieces together — the stages that wear at the same rate
- ✔ Sized for 604 canisters — fits EW-604 and HW-604 units
- ✔ Restores flow — a fresh sponge stage recovers pressure
- ✔ Keeps filtration media alive — protects the biological stage behind it
- ✔ Costs less than a new filter — replacement parts, not a replacement unit
At a glance
| Set contents | 4 pieces (sponges and cartridges) |
| Fits | EW-604 and HW-604 canister filters |
| Type | Pre-filter and replacement media |
| Use | Routine canister filter servicing |
| Cleaning | Rinse in tank water, never tap water |
Is it right for your filter?
This aquarium pre-filter is specified for the EW-604 and HW-604 external canister models, so check the model number printed on your filter head before ordering. Other canister ranges take different sized sponges. If you are unsure, measure the existing sponge before you commit — a sponge that does not seat properly lets debris past the first stage.
Care
Rinse replacement sponges in water taken from the tank rather than under the tap, because chlorine kills the bacteria you are trying to preserve. Squeeze gently, refit, and replace the sponge once it stops springing back into shape. Never replace every stage at once on an established tank — change one and leave the rest undisturbed so the bacteria colony survives.
What’s in the box
4 x aquarium pre-filter pieces — sponges and cartridges for EW-604 and HW-604 canister filters.
Servicing a canister filter? Browse our filtration and water equipment, or add the biochemical sponge filter for air pump setups.
For information on aquarium filtration, see the PetMD fish care guide.
| Weight | 21 lbs |
|---|---|
| Dimensions | 21 in |
| Type | fish |
| Choice | yes |
Frequently Asked Questions
It is sized for the EW-604 and HW-604 external canister filters. Check the model number on your filter head before ordering.
Four, covering the sponges and cartridges that wear at a similar rate, so you can service the filter in one go.
Always in water taken from the tank. Rinsing under the tap kills the beneficial bacteria you are trying to keep alive.
No. On an established tank, change one stage and leave the rest, so the bacteria colony is not wiped out and the tank does not cycle again.
Rinse them at each service and replace once they stop springing back into shape or the filter flow stays low after cleaning.
Usually not. Low flow is most often clogged sponges, which this set replaces far more cheaply than a new canister unit.
✔ Heavy glazed ceramic
✔ Non-slip, tip-resistant base
✔ Seven colours available
✔ Does not absorb odours
✔ Rinse-clean surface
• Press the bowl into the bedding so it sits level
• Rinse and refill daily
• Wash with warm soapy water every few days
• Avoid abrasive scourers on the glaze
• Check the rim for chips and replace if cracked
Aquarium Pre-Filter – 4-Piece Set for 604 Canister Filters
Canister filters lose flow long before they stop running — the sponges clog, the pump strains, and the water that should be polished starts looking cloudy. This aquarium pre-filter kit supplies the four pieces that get replaced together: sponges and cartridges sized for the EW-604 and HW-604 external canister range. Keeping spares means you can swap a clogged stage instead of buying a whole new filter.
Why fish keepers choose it
- ✔ Four pieces together — the stages that wear at the same rate
- ✔ Sized for 604 canisters — fits EW-604 and HW-604 units
- ✔ Restores flow — a fresh sponge stage recovers pressure
- ✔ Keeps filtration media alive — protects the biological stage behind it
- ✔ Costs less than a new filter — replacement parts, not a replacement unit
At a glance
| Set contents | 4 pieces (sponges and cartridges) |
| Fits | EW-604 and HW-604 canister filters |
| Type | Pre-filter and replacement media |
| Use | Routine canister filter servicing |
| Cleaning | Rinse in tank water, never tap water |
Is it right for your filter?
This aquarium pre-filter is specified for the EW-604 and HW-604 external canister models, so check the model number printed on your filter head before ordering. Other canister ranges take different sized sponges. If you are unsure, measure the existing sponge before you commit — a sponge that does not seat properly lets debris past the first stage.
Care
Rinse replacement sponges in water taken from the tank rather than under the tap, because chlorine kills the bacteria you are trying to preserve. Squeeze gently, refit, and replace the sponge once it stops springing back into shape. Never replace every stage at once on an established tank — change one and leave the rest undisturbed so the bacteria colony survives.
What’s in the box
4 x aquarium pre-filter pieces — sponges and cartridges for EW-604 and HW-604 canister filters.
Servicing a canister filter? Browse our filtration and water equipment, or add the biochemical sponge filter for air pump setups.
For information on aquarium filtration, see the PetMD fish care guide.
| Weight | 21 lbs |
|---|---|
| Dimensions | 21 in |
| Type | fish |
| Choice | yes |
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