Astanga Hrudaya
मध्येष्वेष्वेव मध्योऽन्यः पित्तास्रगुदजन्मसु। बलार्थं क्षीणपानीये क्षाराम्बु पुनरावपेत्॥२३॥
Madhyama kshara is useful in the same diseases of moderate strength (diseases not very difficult to cure). The other one, i.e., mridu kshara is used in the diseases arising from pitta, blood and hemorrhoids. When the kshara loses its water content, some quantity of alkali solution should be added to strengthen it.
english translation
madhyeSveSveva madhyo'nyaH pittAsragudajanmasu। balArthaM kSINapAnIye kSArAmbu punarAvapet॥23॥
hk transliteration by Sanscript