For engines of my size, 1 gph is optimum. Lower would be nicer, but that's all I can get.
A filter ain't getting rid of minerals. To do that, you need to distill the water. Maybe your municipal water is clean, but our tap water is brutal when it comes to scale build up.
We use distilled in our injection systems for the same reason we use distilled water in the radiator. So we don't have to deal with the problems further on down the road.
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