PURE+ Filter Start Gel is a live concentrated bacteria culture for use in new pond filters. The gel based solution will stick to the filter media allowing the nitrifying bacteria it contains to rapidly colonise your filter. Once the filter media has been coated with PURE+ Filter Start Gel the beneficial bacteria within the gel will speed up the maturation of your filter media while helping to convert ammonia and nitrite resulting in less stressed fish.PURE+ Filter Start Gel now sits alongside the award winning PURE Pond Bomb and PURE Pond to make a full product range that should be added to every pond keepers armoury.The PURE+ Filter Start Gel is well suited for use in bead filters particularly Evolution Aquas K1 Micro Bead filters to speed up maturation from day one but is equally effective when spread on japanese matting conventional beads and other types of filter media.PURE+ Filter Start Gel is available in 1 Litre and 2.5 Litre sizes. Key features: Live concentrated bacteria culture gel sticks to the filter media allowing the nitrifying bacteria it contains to rapidly colonise your filter beneficial bacteria within the gel will speed up the maturation of your filter media helps to convert ammonia and nitrite that results in less stressed fish.