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with a 3/4" fittings on the filter, it sounds like a whole house filter-- kind of overkill for what you want to use it for.
If you don't feel comfortable doing this, you probably shouldn't...
You will obviously need to shut off your water....
To tap into that 1/2" line, you will need to cut the line and you will need to be able to pull one or both ends about 1/2"-3/4" away from each other.
Easiest way is to use a compression tee of the diameter of the copper pipe--
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You will cut out a small section of the copper pipe-- enough so that if you hold the fitting up next to the pipe, the ends will be about where the inside of the nuts on the fitting will line up with the ends where you cut it...
Slide one end of the pipe out and slide the compression fitting onto the pipe-- you might want to mark the pipe with it slid on so you know it did not move as you tighten-- slide the other end of the pipe into the other end (and mark this too)Using 2 wrenches tighten the compression nut onto the pipe-- hold the fitting with one wrench and tighten the nut with the other-- what this will do, as you tighen the nut, it will compress a "ferrule" (a brass insert) onto the pipe and this will seal the fitting-- you will have to tighten it pretty good-- tighten the other nut too the same way... if it leaks or drips a little you can go back and re-tighten so it is better to undertighten a bit then to overtighten.
If you need to rotate the tee, you can loosen these nuts to rotate it and then tighten them back up.
If you don't want to run copper all the way to the filter, you can adapt to cpvc (cpvc is "tan" collored and is used for drinking water)--- you probably can't adapt directly--- to adapt-- get a compression to NPT adapter
Compression to NPT Adapter
and a NPT to CPVC adapter
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and then just run pvc to the filter unless you want to run copper all the way to filter
if a smaller diamter then 3/4" for your filter is used, I'd adapt up when I get to the filter... they should sell adapters.
If you don't have a valve near where you tapped in you might want to put a valve right before the filter so you can easily shut it off to change out the filter...
You should support the pipe/tubing every 5 or 6 feet--
Once again, if you don't feel comfortable doing this... I would not try....it might be easier for you to just run some garden hose from your laundry room cold water (get a "Y" valve) and run this to the filter and only use when you are making new water...
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FYI-- I am comfortable doing this as I've done stuff like this on hydraulic systems running up to 3000 psi -- but sorry I am not a licenced plumber, so can't do this for you.
HTH...
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