Hi, so I've heard some people say that after buying a new pen, they fill it up to 1/2 or all of the ink and eject it into the sink to basically 'clean' the pen as most shops they buy FPs from have a bit of ink remaining for customers to test. I've recently bought a new pen and washed it by filling it with water and making sure there's no leftover ink in the piston. However, I'm not sure if I have to fill it, eject it and fill it again or just fill it once and forget about purging it. If I went with the purging, would that be unnecessary and a waste of ink?