Here's my two cents. May not be worth that though, lol. I'm running a 1" pump, with the harbor freight 30 gal air compressor. I have 3/4" spray hose and 1" fluid lines. I have multiple tanks and a fluid manifold that lets me switch to different tanks. But for the sake of simplicity, let's forget the multiple tanks and fluid manifold. For testing purposes, from one of my 275 gallon totes, I have a 1" suction line going directly to the 1" pump. From pump there is a 1" line going to Hannay reel with 200 ft of 3/4" spray hose with a Master Nozzle. I was running 50' of 1/2" air hose to an air manifold that has a 20 CFM Tsunami water separator, then to a regulator/filter (set at 90 psi), then to the 1" pump. When I first got my system up and running I was expecting 50' spray distance, BARE MINIMUM. I got 35'. Needless to say I was not a happy camper. I double checked everything, noticed the pump I purchased was leaking like crazy. Tightened all the bolts down on the wet end of pump and stop those leaks. Notice Tsunami is not catching any water, but regulator/filter is slap full of water. That's the Tsunami's job and its supposed to be the best of the market at doing it, but mine wasn't catching any. Come to find out, my air lines are incredibly hot. And being in south Louisiana with the heat and humidity isn't helping. Put the 50' of air hose in a bucket of water and the Tsunami starts working better. It's catching about 1/2 of the water and the regulator/filter is catching the other 1/2 of water. Tsunami should be catching most of the water though not just half. I call Tsunami, they say move up to a 50 CFM. My entire air system is 1/2" throughout, but the Tsunami 20 CFM has 1/4" inlet and outlets. Tsunami says this is a problem and that I'm right on the edge of the CFM total for the HF compressor (19 CFM). The 50 CFM model has 1/2" in and out. I says, OK, and order 50 CFM. Get it installed and it captures about 90% of the water now. Much, much better and I'm spraying 40' distance now. Exact same setup, just changed out water separator and got another 5'. And yes, I have the entire 200 ft of spray hose unreeled when I'm doing these tests. Still I should be getting more distance from what EVERYONE else is saying. I can't remember where on here, but I think someone was hitting 70' with a 1" setup and a HF compressor. That may be the exception to the rule, but 50' is the minimum I've seen for a 1" setup. Make some more inquiries via phone calls to various people/members and as soon as I said 1" suction lines, they said "That's your problem". Consensus was to move to 1 1/2" suction lines and if you want to get crazy go to 2" lines. What the heck, let's get crazy and see what happens. I get some plain ole 2" white sch 40 pvc for a quick test setup. I can hear all the gasps and murmuring across the Internet already! He's using sch 40, white pvc!! It's possible the world could end. LOL, it was only used for a few minutes for testing and it's cheap. For anyone new, don't use Sch 40, white PVC in your system for a long term setup. Anyway, I hook up 2" suction line directly to pump (reduced it down to 1" at pump), put about 50 gallons water in tank and fired it up. I got 50'. Hooray, I've finally got what I should have been getting all along. Now I need to either move everything over to a 2" system (lines, fluid manifold, etc.) or possibly see what 1 1/2" lines would get me. Either way, I don't have the funds to completely retrofit everything with new lines and connectors. So, I'll probably go with my 1" fluid lines and 40' distance for the first few jobs. Speaking of which, I'm having a devil of a time getting my fluid lines to not leak. Ordered fluid lines as a package and all of them leaked. Took them to Parker Hose and they redid them. Son of a guns still leaked. Leak is coming from where the hose snugs up to the camlock, not the camlock itself. Took them back and they used big double bands this time. Suction hoses don't leak, but the fluid line that goes from pump to reel (one that is under a little bit of pressure) still leaks. Parker Hose is baffled. Say there is no way those things should leak. Now I'm trying to find a guaranteed no leak hose solution. This entire setup seems to have been fighting me every step of the way. I've learned a lot of lessons the hard way and it has cost me way more money that it should have. Oh well, lessons learned. So, to highlight: (IF YOU HAVE THE MONEY, if not screw it. You dog gone go with what you got, get a few jobs done and then upgrade as budget allows.) Buy biggest compressor you can, preferably 18-20 CFM If you are using a 1/2" air manifold, go with the Tsunami 50 CFM model Get 50' air hose and put it in a bucket of water or if you have a water tank stick it in there. Gotta get the air cooled down for the water separator to work correctly. Go with at least 1.5 - 2 X size bigger fluid lines than your pump size. Use 3/4" spray hose. If not in the budget, go one size down. Master nozzle will get you an extra couple of feet distance in reality. Don't expect it to add 5-10 ft. Bunch of other stuff, but this covers the main ones. I tried to get everything perfect on my build and it cost me a lot of time and money. And it wasn't close to being perfect. If you have a working system, go work. Upgrade as needed.