Table 15 (Continued)
Chemical-Specific Feeding Recommendations
Feeding Recommendations
Chemical-to-
Suitable
Common Name/
Best
Water Ratio for
Types
Accessory
Handling
Formula
Feeding
Continuous
of
Equipment
Materials for
1
Solutions2
Use
Form
Dissolving
Feeders
Required
Full strength
----
Solution
Scales
Iron, steel,
AMMONIA, AQUA: NH4OH
L-I-W
Drum handling
rubber,
(Ammonium hydroxide,
Diaphragm pump
equipment or
Hypalon,
ammonia water, ammonium
Plunger pump
storage tanks
316 ss, Tyril
hydrate)
Bal. diaphragm
Transfer pumps
(room temp.
Chlorine-ammonia
pump
to 28%)
treatment
pH control
Nutrient
Gravimetric
Dry feed:
Finer particle
Rubber hose,
Hopper agitators
L-I-W
0.5 lb/gal max.
sizes more
iron, steel,
Non-flood rotor
CALCIUM HYDROXIDE:
Belt
Slurry:
efficient, but
concrete,
under large
Ca(OH)2
Volumetric
0.93 lb/gal
more difficult
Hypalon,
hoppers
(Hydrated lime, slaked
Helix
(i.e., a 10%
to handle and
Penton, PVC-1
lime)
slurry)
Universal
feed
No lead
Coagulation, softening
(Light to a 20%
Slurry
pH adjustment
conc. max.)
Rotodip
Waste neutralization
(Heavy to a 25%
Diaphragm
Sludge conditioning
Plunger pump5
conc. max.)
Precipitate PO4
CALCIUM HYPOCHLORITE:
Up to 3% soln.
0.125 lb/gal
Liquid
Dissolving tanks
Ceramic,
Diaphragm pump
in pairs with
glass,
max. (practical)
makes 1% soln.
Ca(OCl)24H2O
Bal. diaphragm
drains to draw
rubber-lined
of available
(H.T.H., Perchloron,
pump
off sediment
tanks, PVC-1,
Cl2
Pittchlor)
Rotodip
Injection nozzle
Penton, Tyril
Disinfection
Foot valve
(rm. temp.),
Slime control
Hypalon,
Deodorization
vinyl, Usco-
lite (rm.
temp), Saran,
Hastelloy C
(good).
No tin.
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