PURE+ Filter Starter 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 the PURE+ Filter Started 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.