Discount has already run a business before and from what I have read still does, he brings a lot to the table and is always trying to come up with things that make the job easier and also time saving and after prompting shares this info on here.
being quite new to wfp I can say hand on heart that you need to get the right system from the start, Andrew M also purefreedom.co.uk I would use without a doubt as they was once one and both give the answers I look for,
Always get a bigger tank size than you need to start out, go from a small tank and you will kick yourself when you start to get more custom. I personally would say one man 500L min 2 man 650l min I say that from sending guys out with tanks each day only twice have the 650L tank for 2 men ran dry in near on a year 5 days a week, on the RO side you can get a merlin or 300 gpd, again I personally went for a 4040 because I hate waiting for things and the others are dog slow if you compare booster pump saves a whole lot of time, getting your pre filters from wintecs saves you an arm and leg from what others charge for them.
if you have a tds from tap of over 20 then 2 di vessals inline will save you on resin, mine is 470+ ppm. (Andrew I hope you have this inbuilt now on your systems for hard water clients unlike every other supplier out there)
Another tip would go and see someone else cleaning wfp something I didnt do and had to learn by defult I watched 2 windows being cleaned then went straight out with one of my guys wfp, I recon it took at least three times as long first cleans.
defo learn trad.
If I can think of anything else I will add to it