connections

I just bought a new filter to pump hose, and the pool store gave me a new "union" connector to screw into my filter. I put some teflon tape on and threaded it in. It has a slow leak, probably a drop every 2 minutes or so. I took it out and put more teflon on., but still leaks.
My question is what is better, a lot of teflon until it stops leaking or just one or two layers??
Also, I ended up threading it in pretty much all the way, is it better to only thread in just enough or all the way??
It is definetely leaking from where the union threads into the filter, the plastic on plastic thread.
Thanks
Barry

One drop every 2 minutes is not a big deal, I wouldn't worry about it. If it is a problem, it could be the connector you just got from the pool store, if it wasn't leaking before you replaced it. Try buying a similar connector (and probably cheaper one) at a hardware store and see if that is better.

Still wondering is it better for seals to add more teflon or keep at a minimum??
Also, thread the connection in all the way, or half way?