I noticed that my commode tanks have sand in them, so it sounds as if I should not use a RPZ. I had a PVB for years and years but I suspect its placement might have been lower than the highest sprinkler head point because my yard slopes.
How do you measure determine the highest point relative to the placement of the PVB?
I am under no regulations, so I can use whatever. Is the PVB safe - does it do a good job? I use no fertilizer nor herbicides/pesticides, but my neighbor loves to spray Roundup and sprays some near some of my sprinkler heads.
This post has been edited 1 times, last edit by "nine9s" (Feb 11th 2013, 9:43pm)