These 5000 litre filters all have the "EasiCleanse" backwash cleaning system. Includes as standard, specially developed profile foam, Japanese filter matting, plastic bio media and low voltage electrics. You can bury them to hide them or have them far away, sited in the shed, garage or greenhouse. The UV is low voltage for safety and comes complete with outdoor transformer. They are very user freindly. 5000 model has an 7 watt UV , Clearwater Guarantee.