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What is your setup like? How many, what kind of filters do you have?
What is the micron rating of your particle filter?
Is the city working on the water lines in your area?

The lines in your system may need to be trimmed back due to compression leaks if you've messed with them.
They should not leak for a long time, but could be due to fitting seating issues, or if you've messed with them a bunch of times
Re-seat all your lines and all should be good - remove a line from a fitting and trim the end off - then reseat the line by pushing it fully into the fitting
It's always a good idea to use some kind of lube and make sure the ends of the tubes are not sharp so they don't damage the o-rings inside the fittings

So, If you have enough slack in your lines, remove them from the fittings and trim them back a tiny bit. When you do so, make sure they have no sharp edges before you re-insert them into the fittings

I use locks to keep my lines from backing out

http://www.isopurewater.com/thumbnai...axx=300&maxy=0