【Easier Service Life】 700g replaces the power of 25kg of filter sand, quartz sand or 20kg filter glass. This saves you energy and time when refilling the filter. Remarkable cleanliness: Filters even the smallest dirt particles down to 1 micron and also filters grease from the water. 【Reusable】 100% polyethylene material, the filter balls can be washed and reused. Save energy, costs and other pool accessories. Universal use: Our filter balls are universal for cleaning almost all filter boilers. Also suitable for sand filter pumps in salt water. 【Scope of application】 - Swimming pool, filter pump, aquarium, etc. The use of filter balls can lead to a clean and clear water quality effect