4.9.7 Maintenance

Maintenance requirements for rain water collection systems include typical household and system specific procedures. All controls, overflows, and cleanouts should be readily accessible and alerts for system problems should be easily visible and audible.
  • Debris should be removed from the roof as it accumulates.
  • Gutters should be cleaned as necessary (for example in September, November, January, and April. The most critical cleaning is in mid- to late-Spring to flush pollen deposits from surrounding trees.
  • Screens at the top of the downspout should be maintained in good condition.
  • Pre-filters should be cleaned monthly.
  • Filters should be changed every six months or as a drop in pressure is noticed.
  • Storage tanks should be chlorinated quarterly at 0.2 ppm to 0.5 ppm or a rate of 1/4 cup of household bleach (5.25 percent solution) to 1,000 gallons of stored water.
  • Storage tanks should be inspected and debris removed periodically as needed.
  • When storage tanks are cleaned, the inside surface should be rinsed with a chlorine solution of 1 cup bleach to 10 gallons water.
  • Roof washers should be readily accessible for regular maintenance.
  • Pre-filtration screens or filters should be maintained consistent with manufacturer’s specifications.

See Appendix G: Maintenance of LID Facilities for additional maintenance recommendations for maintenance of rain water harvesting systems.