Yuav ua li cas los daws qhov siv lim xovxwm txoj siv slip

1, siv hom lim xovxwm siv skid feem ntau yog vim cov sludge load siab dhau lawm, yuav tsum txo cov sludge load;

2. Lwm qhov laj thawj yog tias qhov nro ntawm txoj siv lim yog me me, yog li qhov nro yuav tsum tau nce ntxiv;

3. Yog tias cov menyuam muaj kev puas tsuaj, nws yuav tsum tau kho lossis hloov raws sijhawm.