TM 5-4610-223-12washed away. When valve CV-36 is in WASH position it allows the water to enter the wash ring (6, fig. 2-28) and washthe sediment from the bottom of the filter. After washing, filters are ready for precoating.c.OperatingDetails. After the water purification unit Is in operation, there are certain adjustments to be made andprocedures to be followed. This will depend on the quality and quantity of the raw water being pumped.(1)Adjustmentofchemicaldosagesettings.(a)General. The operator must apply proper chemical treatment based on clarity of the water aboveslurry pool in erdlator tank, filterability of this water, and the length of filter run. Raider Model only loosen thumbscrew (2,fig. 2-5.1) and rotate ferric chloride control knob (1) to a higher stroke setting. Retighten thumbscrew.(b)Treatedwaterlookscloudy. If the treated water above the slurry blanket in the erdlator tank lookscloudy, Increase the ferric chloride solution rate of discharge. Move the feed indicator FEI-7 (5, fig. 2-5) to a higherfeeder scale (9) reading. Use the ferric chloride solution calibration chart (fig. 2-9) as an aid in determining the propersetting. A more accurate determination of the proper chemical feed rates for the operation of the water purification unitcan be determined by the use of the Water Quality Analysis Set (WQAS). Refer to TM 5-6630-215-12, Water QualityAnalysis Set, Preventive Medicine (NSN 6630-00-140-7826), Engineer (NSN 6630-00140-7820).(c)Treatedwaterhasreddishcolor. If the treated water above ,slurry blanket in the erdlator tank begins to havea reddish color, decrease the ferric chloride solution rate of discharge. Move the feed indicator FEI-7 (5, fig. 2-5) to alower feeder scale (9) reading. Raider Model only loosen thumbscrew (2, fig. 2-5.1) and rotate ferric chloride controlknob (1) to a higher stroke setting. Retighten thumbscrew. Use the terric chloride solution calibration chart (fig.2-9) as an aid in determining the proper setting. Use Water Quality Analysis Set (WQAS) for more accuratedetermination of proper chemical feed rates.(d)Treatedwaterisclearwithlargeparticlesandblanketfluffy. If the treated water above the slurry blanket inthe erdlator tank looks clear but large particles are rising and the blanket looks light and fluffy, increase the limestoneslurry rate of discharge. Move the variator feed indicator FEI-6 (1, fig. 2-14) to a higher feeder scale reading. Use thelimestone slurry calibration chart (fig. 2-12) as an aid in determining the proper setting. Use Water Quality Analysis Setto determine the best chemical feed rate.(e)Visiblelimestoneinsamplefromsludgeconcentratortank. If a sample of slurry, withdrawn from the bottomof the sludge concentrator tank, contains visible quantities of limestone, decrease the limestone slurry rate of discharge.Move the variator feed indicator FEI-6 (1, fig. 2-14), to a lower feeder scale reading.Use the limestone slurry calibration chart (fig. 2-13) as an aid in determining the proper setting.(f)Chlorineresidue. In order to maintain a chlorine residual in the filtered water, determine the chlorine residual(paraChange 4 2-53
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