... the error is too large, the installation of the filter head can not be on the same level, causes water distribution and ... distribution is uneven, will lead to Recoil uniform degree of inconsistency of the filter layer, resulting in filter local backwash strength too large ... to 150mm, 200mm, etc., per m2 filter head layout based on user needs, 49, 56, 64,etc.Main Usage:1,The ...