A slow/intermittent sand filter that purifies polluted water by flowing through sand in a manner that achieves greater purity and permits simpler and more effective maintenance than existing filters.
申请公布号
US2011303623(A1)
申请公布日期
2011.12.15
申请号
US201113159705
申请日期
2011.06.14
申请人
CALDWELL E. NEAL;HODGES JOHN KEVIN;DALEN PRODUCTS, INC.
