Pond One ClariTec 15000 Pressurised Filter With 13W UV-CSolid construction ClariTec from Pond One is a pressurised pond filter with a real feel of quality. The Construction is solid and the media content is convincing. Designed to withstand pressures of up to 0. 5 bar the ClariTec can be hidden in the ground beside the pond and then return the filtered pond water back via a waterfall perhaps. Extra space for more filter media As with any filter the true test is the mechanical and biological effectiveness.