It is possible that the filter-aids could be made from low grade diatomite and perlite;

认为低品位硅藻土和珍珠岩经过适当加工是可以制成合格助滤剂的；

youdao

It is possible that the filter-aids could be made from low grade diatomite and perlite;

认为低品位硅藻土和珍珠岩经过适当加工是可以制成合格助滤剂的；

youdao