Pond Keeper 1.25 from GC Tek

Finally a low cost, high performance filter with all of the quality and dependability you have come to expect from us. Just take a look at these features:
The PondKeeper media is so unique, there is no other exactly like it. Designed to protect sensitive beneficial bacteria during backwash, while providing huge amounts of surface area for the bacteria to live and prosper.
The PondKeeper filter utilizes a totally unique backwashing jetting system we call the "FLUFF-N-SPIN" system. Not only does the internal design of the filter allow for a "FLUFFING" of the media during backwash, but spins the bed and each individual piece of the PondKeeper media. This causes the media to get rid of any old bio floc that might be clinging to each piece, while holding on to the precious beneficial bacteria with in the filter. There is no other like it. Due to the "FLUFF-N-SPIN" agitation system and the design of the media, these units backwash beautifully using any low amperage koi pond pump.
Complete with 1 HP Media Agitator
For More:https://aquabead.com/category/pondkeeper-water-garden-filters