Impurities are held by the filter media inside the tank.Sand filters are compact sized, easy to install and use and special care is not required.They include a prefilter to hold the largest particles to prevent pump from any damage.These independent filters are designed yo be used with a filtration pump (not included) Features:- Sand filter for above-ground swimming pools.- Without pump.- To be used with a filtration pump (not included).- Filtration capacity 6,000 litres.- It is very compact.- Easy to install and maintain.- Thanks to its 6-way selector valve, different functions can be performed:washing, rinsing, filtering, recirculating, emptying and closing.- Bucket diameter of 400 mm.- Includes a pressure gauge indicating the pump flow pressure.- Valid for filtering substances like:sand, glass and Aqualoon.- Allows a sand load of ± 40 Kg (not included).- Needs hoses with 38 mm (not included).- Plastic base Specifications:- Dimension:40 x 40 x 70 cm.- Type of pool:Steel above ground pool.- Type of filter:Sand / glass 400 mm.- Flow filter:From 4 to 6 m³/h.- Filter diameter:400 mm.- No.of valve pathways 6 ways.