They're a little denser which I really like, they slow the water flow and keep my aquarium clean. They often clog up after a few months and I can wash each one about 4-5 times. I think it's great (because of the large surface area in the tank) and I immediately bought a new kit. I like them better than the ones with pores.
KEDSUM 330GPH Ultra Quiet Submersible Pump With High Lift And Grounded Power Cord - Ideal For Fish Tanks, Ponds, Aquariums, Statuary, Hydroponics - Includes 3 Nozzles And 1500L/H Water Flow
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