The preflush, for me, is to get the small crud out of the system to reduce the need to clean the foot valve, that's all. .... The use of my system is to water the garden.
Perhaps your area is different from the Central Valley of California, in which winds bring: lead and other nasties from vehicle engine exhaust, chemicals from agriculture, and smog particles of who-knows-what from the big cities upwind. I would not want to incorporate any more of this stuff into what I eat than I have to.
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