Keep your pond water crystal clear with these replacement sponge filter pads made specifically for VIVOHOME 1580/1840GPH biological pond filters! This handy 4-pack includes 2 blue sponges for coarse filtering (catches the big stuff) and 2 yellow sponges for fine filtering (grabs the smaller particles). They're also compatible with SUNSUN/Grech CPF-2500 and CPF-3500 filters, so if you've got one of those, you're good to go. These pads do double duty – they trap debris without slowing down water flow AND provide biological filtration by hosting beneficial bacteria that break down harmful waste. Made to be rinsed and reused, just give them a clean every month or two (or whenever you notice less water flow) and replace them every 6 months for best results. A little tip: they come vacuum-packed, so they might look flat at first. Just soak them in water for about 5 minutes, and they'll puff right up to their full size. Super easy to maintain and perfect for keeping your koi and fish happy and healthy!
