Aqua One MariSys Overflow Box Blue Sponge 413s (25413s)

Polish passing water while supporting beneficial bacteria across a reusable filtration surface. Essential pre-filter sponge for Marisys 240. The structure of foam sponge collapses over a few months of repeated washing giving rise to restricted water flow and a requirement for more frequent cleaning. Change your Marisys pre-filter sponge regularly for best performance. • Open pore structure for uniform water flow • Change every 4 months • Easy to change • Genuine Aqua One part We recommend only using Aqua One genuine spare parts in their range of filters