sand and gravel filter

同义词释义

1)sand and gravel filter,砂砾石过滤器2)sand filter,砂砾过滤器3)gravel filter,砾石过滤器4)rapid sand filter,快速砂砾过滤器5)grit filter,砂石过滤器6)gravel bed filter,砾石滤床过滤器;砾石滤床滤池