Coping with Vog on Catchment Tanks
Although airborne, ash will eventually land on everything in its path: roofs, porches, lawns, crops. Vehicles driving can stir up ash on roads. Residents on water catchment systems may want to disconnect their downspouts during periods when a large amount of ash is being deposited on the roof, to prevent ash from entering their water systems, which could clog plumbing and filters and damage pumps; downspouts should only be reconnected after the ash and dry-deposition aerosols have been thoroughly washed from the roof. However, Halema’uma’u is currently producing a relatively small amount of ash that will likely settle into the bottom of water catchment tanks. Homeowners on water catchment may need to change filters more often, and perhaps clean the bottom of their tank periodically, as these tiny amounts of ashfall accumulate.
If an increased amount of SO2 is landing on your roof, the water in your catchment tank will likely be more acidic than usual. You can add baking soda to your tank to help neutralize the acid rain; a box or two once or twice a month should do the trick.