Ko te tikanga whakahiato onaphthalene te kaha teitei o te kai whakaheke wai:

(1).Naphthalene i whakangotehia i te pāmahana teitei (160 ~ 165 ℃), te nuinga o te whakaputa waikawa β-naphthalene sulfonic, engari he iti ano te nui o etahi atu waikawa naphthalene sulfonic;

(2). Taapirihia he wai hei whakamaroke i te waikawa α-naphthalene sulfonic acid, kia piki ake te ihirangi β-naphthalene sulfonic acid;

(3). Ko te waikawa β-naphthalene sulfonic me te waikura formaldehyde;

(4) Whakakore.

Ko te hangarau tono onaphthalene te kaha nui o te kai whakaheke wai:

1.Ko te kaha wawe me te raima kaha teitei kua whakaritea. I te ranu 0.5%~1%naphthalene te kaha teitei o te kai whakaheke waikia rite ki te taimaha o te sima, ka taea te whakaiti i te wai i te 16% ~ 25%, a ka taea te whakanui ake i te kaha raima e 20% ~ 50% (te kaha wawe o te raima ka piki ake).
2.Ko te whakarite o te raima rere nui, ka tenaphthalene te kaha nui o te kai whakaheke waimo te inenga ciment o 0.2% ~ 0.5%, ka noho tonu te kaha o te raima, ka taea te whakanui ake i te paheketanga o te raima ki te 10 ~ 25cm, whakamahia mo te gravity grouting, te pupuhi raima, ka taea te tere ake i te ahunga whakamua o te hanganga, te whakapai ake i te kounga o te hanga.
3.ave sima, i raro i te huru o te pupuri i te kaha o te raima e kore e heke, tāpiri e pā ana ki 0.5%naphthalene he kaihoko whakaheke wai paika taea te whakaora sima mo te 20%.