TM 55-1930-209-14&P-4 Table 4-2.  Preventive Maintenance Checks and Services for Chlorination System (Continued) B - Before D - Daily Q - Quarterly D - During W - Weekly S - Semiannually A - After M - Monthly A - Annually Interval Procedures Item Check For And Have Equipment Item To Be Repaired Or Adjusted Is Not Ready/ No. B D A D W M Q S A Inspected As Necessary Available If 6 Brine Tank a. Check brine tank salt level  and add salt as necessary. b. Check cooling water and makeup water flowmeter and ammeter readings. Adjust water and brine feed control. c. Check condition of cells for scale buildup. Descale when necessary as follows: 1) Rush with seawater. (a) Check that seawater system is operating and providing sea- water to chlorination system thru seawater SW47 or SW48. (b) Turn alarm ON/OFF switch on control cabinet to OFF. (c) Turn function switch on control cabinet to OFF/RESET. (d) Position chlorination unit (CU) valves as indicated below: O - open   X = closed   A = position A B - position B    C. = position C CU Valve No. Valve Position 2 x 2A X 3 B 5 A 6 x 6A X 8 x 9 x 12 x 16 O (e) Position valve CU4 halfway between position A and C to reduce flow thru system. (f) Turn brine pump ON/OFF switch inside control cabinet to OFF. C-6