Are these needed? I got the 340 ATV for free with a broken belt and it just came with a regular hose, no leader, weights, or flow indicator. What's the difference between a leader hose and a normal hose section? My normal hose connects just fine to the cleaner. Can't I just count the wheel RPM and skip the flow indicator? Do you really need to weight the hose? My pool is about 15' x 28'. Thanks!