2-7. ROWPU ASSEMBLY AND PREPARATION FOR USE - cont.
Prepare Chemical Solutions.
Open storage chest and remove wood paddles.
Open storage chest and remove sodium hex, polyelectrolyte and calcium hypochlorite measures.
Remove polymer, sodium hex, citric acid and calcium hypochlorite chemicals from storage chest.
To prevent contamination of chemicals, mix chemical solutions in separate pails. Use separate
wood paddles for each mixing task.
Using pen, pencil or marker, label four utility pails as POLYMER, SODIUM HEX, CHLORINE and CITRIC
ACID. The fifth utility pail remains unmarked.
Chemicals used for operating ROWPU can kill you. The chemicals alone or in mixture can be
dangerous. ALWAYS wear protective apron, goggles and gloves and make sure area is well
Use only chlorine free water for mixing to prevent damage to ROWPU membranes. If this is the
first time the ROWPU is being started, use raw water to mix chemicals. If you are restarting the
unit, use brine from storage tank.
Mix polymer solution as follows:
Fill POLYMER measure HALFFULL (figure 2-40) with liquid polymer chemical (there is no halffull
mark on measure).
Pour liquid polymer into pail marked POLYMER.
Add brine (if available) or raw water to POLYMER pail up to the 3-gallon mark.
Stir pail with wooden paddle for at least a minute.
Pour solution into chemical feed can marked POLYMER.
Figure 2-40. Polyelectrolyte Measure.