An easy way to clean recyclable polyethylene. Diameter: 60 mm - This saves energy and time when filling the filter. . Cleaning power: The filter balls can not only filter grease from water, but also filter the smallest dirt particles down to 1 micron. . More sand in the pool Pool filter balls are easy to handle and can be used in any common sand filter system. Filtration speed 3.5 times faster than traditional filter media, larger absorption capacity, better filtration effect. . Durable - The filter balls have a high dirt absorption capacity and are therefore very durable, less rinsing time. Filter balls can be washed and reused, save energy, cost and other swimming accessories. . Universal use - Our filter balls are universal for almost all filter boilers. Also suitable for swimming pools, sand filter pumps, filter pumps, aquariums.