1. Cov kav dej tsis tu ncua PPR tau ua tiav cov ntaub ntawv sau rau ntawm cov yeeb nkab lub cev, uas feem ntau suav nrog cov qauv yeeb nkab, qhov loj me, lub sijhawm tsim khoom, cov qauv ua tiav, keeb kwm, thiab lwm yam, thiab cov ntawv sau tau meej meej;
2. Judging los ntawm lub teeb transmittance ntawm cov kav dej, yog hais tias lub teeb transmittance yog qhov pib xoom, ces nws yog ib qho khoom tseeb. Cov neeg siv khoom kov cov yeeb nkab dej nrog lawv txhais tes, hnov qhov smoothness ntawm cov yeeb nkab dej, qhov kev xav ntawm cov yeeb nkab dej tiag yog mos nrog siv quav ciab kev ntxhib los mos, thiab kev xav ntawm qhov cuav yog du nkaus xwb;
3. Raws li hom yeeb nkab dej, mus rau lub vev xaib official ntawm cov khoom siv sib txuas kom nug seb cov kav dej no puas muaj tseeb. Ntau lub npe ntawm cov kav dej muaj cov paib tiv thaiv cuav, los ntawm kev tiv thaiv cov khoom cuav los xyuas seb nws puas yog tiag;
4. Daim ntawv tshaj tawm kev soj ntsuam zoo (electronic version) ntawm cov khoom yuav tsum tau saib seb qhov kev tshuaj ntsuam xyuas zoo puas tsim nyog los yog tsis, thiab seb lub tuam txhab kuaj puas muaj cai;
5. Siv cov kav dej txuag dej thiab teeb nws. Thaum cov yeeb nkab PPR tsis zoo kub hnyiab, nws yuav tawm pungent thiab tsis kaj siab tsw, nrog rau cov pa luam yeeb dub, thaum lub PPR yeeb nkab zoo yuav tsis tsim pungent tsw thaum hlawv, thiab cov colloid yaj thaum hlawv kuj dawb thiab tsis muaj impurities. Thaum hlawv, yuav muaj npuas me me rau ntawm qhov chaw hlawv. Qhov me me npuas, qhov zoo dua.
6. Yog tias qhov kev cog lus kev pab cuam tom qab muag yog qhov tsis ntseeg, koj tuaj yeem hu rau cov khoom lag luam kev pabcuam tomqab muag, lub xov tooj tuaj yeem nrhiav tau ntawm lub vev xaib raug cai.