Hello all.....I'm interested in automating my chlor. delivery...I just started BBB a few weeks ago and my pool has never looked better...i plan on using a Woods timer and a 15 gal. barrel...But a little unclear as to what pump i should purchase...As of now my CYA is at 80PPM..Which i plan on lowering as soon as it cools off...Keeping my FC at 6...and losing about 3-5 ppm/day...Would i be better with the 3 or 10 gpd model?? 25 or 100psi model?? Also do i need the check valve if i get the 100psi model...or just hook it up direct? Thanks!!