The Phaserl


Two Letters Re: Building a Backyard Water Treatment Plant

from Survival Blog:

Regarding “Building a Backyard Water Treatment Plant, by J.S.M.“, I wanted to comment on a couple of errors I saw in the last section on treating surface water with alum. I once worked for a manufacturer of aluminum sulfate and was involved in several trials at municipal water systems.

1. First thing, I would not bother waiting a day for an initial settlement. Once the leaves, twigs, and tadpoles have been removed, you should go ahead and treat the water. It seems paradoxical, but the cleaner the water is when you start, the harder it is to get good flocculation and settlement.

2. I double checked the tuna can measure and was surprised to find that a 5 oz. tuna can does contain about 5 oz. of dry alum.

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