1. High efficiency paddlewheel aerator, with stainless steel impeller and double-deck frame design. 2. Stainless steel 304 blades with professional folding angle, can create both the strong water current and water flower, and increase oxygen supply efficiency 3. All the stainless steel materials in 304 system and are made under iso9001/14001 international standard. 4. High quality pvc pipe, special leak-proof processing, no seeping question. 5. Stable function, don¡¦t need worry for no reason damages 6. Easy maintenance. One 20/40ft container can loaded fj-102 : 72/146 units.