hey man congrats on ur purchase i myself have a phx duo

anything in the outside of the percolator will splash up, I usually just fill it all the way on the inside and yeah about 3/4 to full on the inside (pour the water through the top and it will drip down). I usually don't worry about splashing because the snarf guard blocks most of it, but depending on the size of ur trinity, you may need to pay a little more attention to the amount you put in.

best way to figure it out is trial and error, then pretend to hit it and see if you get water in your mouth. also keep in mind that the ice melting from the pinch drips into the perc, so you may have to pour a little out over the course of your sesh.

keep it real imp: