rate contract of boilers chemicals for maintaining p.h. and t.d.s. . , rate contract of boilers chemicals for maintaining p.h. and t.d.s.: , boiler chemicals to maintain the ph-10, tds max. 1500, phosphate 20, boiler water should be free of oxygen. nhc/basf/ thermax / ion exchange/chemcon- make (dose per day) hydrogen base (boiler capacity 25 ton per hour) sludge chemical n-63/3223, oxygen savenger n-61/3100, p.h. booster n-70/3006 for boiler n-70 etc. with technical supervisor. (as per requirement) (during crushing season 2024-25) note:- boiler shall have to maintain parameter as following:- (i) ph – 9.5 to 10.5, (ii) t.d.s.- 1000 to 1500 rpm (iii) po4 – 10 to 20 ppm (iv) so3 – 20 to 30 ppm (v) n2h4 – 0.1 to 0.4 ppm (vi) t-alka – 300 to 400 ppm (vii) oh-alka- 150 to 200 ppm, (viii) rine ph – to 15