Foam Block Pre-Filters are attached to the inlet of your pond pump. Many feature pumps come with a small cage and sponge over the front of the pump. These small sponges are designed not to filter your water, but to protect the impeller of the pump from debris. If you remove the small cage and sponge from these pumps you will find a thread, usually female and you can then attach a large foam block pre-filter. This will help to clean your water while protecting your pump at the same time. Because the filter is much larger, it takes a long time to block up and you cut down on maintenance while your pump doesn't have to work as hard.
- Help keep small ponds cleaner
- Needs cleaning out much less frequently than the stock standard small sponge on most pumps
- Significantly increases the lifespan of your pump because it takes much longer to block up
- Very good value. If you are installing a pump with a small pump it is a no brainer to put a foam block pre filter on the front and it will pay for itself in no time through reduce maintanence and longer pump lifespan
- Sponge filters on pumps are not suitable for pumps pumping to external filters as it filters the water at the pump and stops debris from passing through the pump and heading to the filter
- The correct size pre-filter can be connected to any pump with a threaded inlet (thread usually sits underneath the standard sponge that comes with some pond pumps)
Refer to the table below to make sure you select the right pre-filter for your pond pump
Any pond pumps which by default come with a small sponge filter on the front and have a thread underneath that sponge.
What we liked:
Very easy to install and clean, the cheapest, easiest way to add a very basic filter to a pond.
Less than ideal:
Nowhere near as effective at keeping your pond clean as an external pressure filter or gravity filter such as the Blagdon Minipond 4500. Also check out the Aquapro in-pond tray filter for a slightly large in-pond option.