02-04-2010, 04:31 AM
The bags at Costco are 6.39 for 13.5 lbs. Cost-U-Less also sells bulk baking soda. The UH CTAHR Cooperative Extension office sells ph test kits at cost ($20 for 100 strips.) You can also pick up the "bible" on catchments at no cost (also available online): Guidelines on Raninwater Catchment Systems for Hawaii by Tricia Macomber. Lots of good info.