I want to use unfiltered lake water for the outside spigot!

First off, I am not a plumber. That "blue thing" is a pressure regulator; without it your pump would come on/off every time you open/close a faucet. It has a rubber diaphragm in it, w/ air pressure on the top and water on the other. As the pump pushed water into it, the diaphragm expands up against the air until a "trip" pressure is hit, at which time your pump is shut off. As you use water, the diaphragm pushes against the water to maintain pressure for a while. Once the pressure drops to a "trip" level, the pump comes back on. The "off" pressure is usually about 60 psi, and the "on" pressure is about 40 psi, in my limited experience. The "trip" mechanism is the gray box w/ the pressure gauge next to it and electrical wires attached to it. As for the water going "the wrong way", I think you are correct. As soon as you open the spigot to water the lawn, the raw water pressure at the filter may be below what the diaphragm is providing and you'd drain your house. That is a GUESS. That said, I am sure someone here can tell you how to install a one-way valve between your filter and the raw water, if one is needed. If it were mine, I'd shut off the valves around the filter and plumb in a one-way, of course having to move the filter's present location a tad. BTW: The little pipe that runs up to your "gray box" can become clogged inside, and when that happens you will no longer have a pressure on/off switch, causing your pump to run like crazy. After going through a few of those episodes, I replaced the little riser pipe w/ a brass one; it has lasted for years now. If you are going to filter the fish poop, I hope you are also harvesting a few fish for dinner. Bass?

Hummm. since the pressure switch controls the pump to come on/off, I'd say try the spigot on the far right and see if the pressure drop on the gauge nearest the regulator. If the pressure drops then you know there is not a one way valve in place. If there is a one way valve then that spigot pressure will eventually drop off to zero since the pump won't kick back on. If that happens (spigot pressure goes to zero) then you'll end up with a big air bubble next time you open up a faucet in the house... which really shouldn't cause any trouble (I'm not a plumber, just thinking to myself here).

That said, my feeling is that there IS NOT a one-way valve, and that using the spigot on the far right will do exactly what you want... unfiltered water under pressure.

-Kevin

By looking at your picture you would have to move your filter upstream, you do have a check valve installed on the left side of the filter so it appears the right spigot wouldn't work. You would have to move the filter to the left of the pressure switch, then you could use the spigot with the green hose attached for un-filtered water. The draw back would be you might have to drain sediment from your pressure tank. I should note that I am NOT a plumber.

A couple things, since I enlarged your picture and looked at it, and re-read my previous post and the other post since mine. First, excuse my jiggled English in the first post; one sentence is a little awkward, but I think you got the drift. It should have read "...It has a rubber diaphragm in it, w/ air pressure on the top and water on the bottom. As the pump pushes..." Second, upon expanding the picture, yes it sure does look like you have a one-way valve, which would preclude your using the far right spigot, as mentioned. You could re-wire and/or re-plumb, but that is starting to look a tad tricky and may not give ideal results (fish poop and algae in the pressure tank, switch pipe, etc). Perhaps it would be best to use a different pump altogether??? Either run another electrical line out to it, or splice into the existing one near the lake, and hook it up to a submersible pump suspended off of a float. Run the electrical to a post w/ a switch on it near the lake. Flip the switch and your hose is squirting water for the lawn. Flip it off when done. Do you water enough that that would be a hassle? Either that, or bag ALL this tinkering and just use the spigot upstream from the filter and replace the filter more often. Sorry, no free fertilizer for the lawn... Thirdly, re: "... you mentioned the pipe that goes up to the switch getting clogged.... It appears to be copper..." Copper is good, and it appears to be 1/2" or so. You should be fine. I was having trouble w/ galvanized pipe corroding, and since it was only 1/4" pipe, a little corrosion was ugly. Just watch for the pump to start running its guts out and remember that the pipe may be plugged. I farted around w/ my switch for a few hours before it dawned on me that the switch really was OK and somebody else was tweaked; learning curves... And finally, ohhh, those smallmouths! Talk about fighters! I miss catching them in Lake Erie. Good luck w/ the water deal.

Not to sound too dumb but is the lake also supplying your drinking water? or is it just supplying things like the toliet and non drinking applications

"I was hoping for an easy solution but it appears I will simply have filtered lawn water… filters aren’t too bad if you buy a few at a time, $20 each or about $45 for 3. I currently change em every 90 days or so."

I think that in the grand scheme of things, buying filters adds very little to your housing expenditures, and leaves more time to fish. That is always of great value. Nice lake. Since we all were of such help, we'll see you in the spring when the ice is out and the smallmouths are starving. Since it is 10 below here, I assume that EVERYWHERE in Canada must have ice, no?

I wouldnt call you a wimp for not drinking it.....I admit I have well water which is pretty much the same thing I guess

I had a 100 micron filter on the hose end of my water line (lots of sediment that clogs the garden sprayers). You can get 250, 500 micron, whatever you need. They are non-disposable (made of steel mesh or something) and clean out in two minutes (you can flush them in situ with a bucket below them). Go to some farmer supply joint with plumbing and they will have them. Filter is like $30 bucks and the housing is like $100.

I had a spring filter and a summer filter cause the water was much clearer in the summer.

Sorry but can not remember the name brand (old house).