Aquarium filter accessory jbl combibloc

Clean, healthy water: pre-filtration block and filter foam for CristalProfi e upper filter basket Use: to be inserted in the upper filter basket 1 medium-pore foam plate 20 ppi, 1 fine-pore foam plate 30 ppi Inert to fresh and sea water, no pollutant discharge Included in delivery: 4 pre-filtration blocks, 1 filter foam 20 ppi, 1 filter foam 30 ppi