Appendix 19 Cleaning of raceway

Note: Refer to Technical Drawings – Pg 14 and Pg 17.
Raceway cleaning involves full chlorination of lines and troughs. The process is similar for both indoor and outdoor raceways. For the indoor raceway, care must be taken to chlorinate all recirculating pipes and sump tank. For the outdoor raceway, algal tank needs to be chlorinated.

1. Turn off pump for recycling system and/or algal supply.
2. Drain troughs, pipes and tanks.
3. Rinse with fresh water.
4. Plug troughs and fill with 50 cm of freshwater.
5. Add capful of chlorine and scrub to remove any detritus.
6. Fill sump tank/algal tank with fresh water to 50 cm and scrub.
7. Drain sump tank/algal tank. Fill with seawater and add capful of chlorine. Mix and let sit.
8. Drain troughs and rinsing with strong jet of fresh water.
9. Indoor raceway: start pump for recycling, open recycling valves and let chlorinated seawater pass through pipes. Watch water level in sump tank so that pump does not run dry.
10. When water level in sump tank/algal tank is low, close off pump.

11. Drain sump/algal tank.
12. Rinse with fresh water and saltwater.
13. Rinse troughs with saltwater.
14. Turn seawater supply on, fill sump tank, turn pump on, and let run through troughs and pipes for 15 minutes.
15. Place standup pipes in troughs, fill for use.
16. Reset recirculation system.
17. Outdoor raceway: Turn pump on to recycle chlorinated water through algal lines. Take care not to let pump run dry.
18. When water level low in algal tank, turn off pump. Open union on drain side of tank.
19. Drain tank and rinse with fresh water.
20. Close union, fill tank halfway with seawater. Turn pump on and let run through algal lines.
21. When low, fill tank with seawater and add algae as per usual.
22. Close trough with standup pipes and fill with seawater.