I need to set up an ATO for my two tanks. However, I do not use an RO unit and do not need to. Reason being, I have spring water that supplies my home that I have used for the last 4 years without any problems. So, would I be able to simply use a float switch to be able to do this. Just plumb with either a pierce valve or with the RO line and fittings from PVC? Also, would my water pressure need to be restricted for the ATO to work properly?