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What's your water like? Ro will get rid of all scale forming compounds, but these are also valuable minerals that extract acids and sugars.
You could just use a cartridge filter, we do, on 100-200 cups per day.
Always start with accurate water content measurements and then go from there.
Get your self a good TDS meter and the Red Sea reef water measurement kit. This will allow you to determine Ca, Mg and Kh, levels
Matisse
Ah good, thanks both.
I'm opening my own shop, all being well- the lease is being sorted out at the moment. I want to install a RO system so that I get consistent water quality, plus it'll be my little secret weapon - none of the other shops in the town understand the need for it.
So there are 6 stage systems with remineralisation ranging from £110 on ebay up to £2.5k for systems like the BWT and La Marzocco which look like they have been designed by Apple.
So I reckon if I sell 100 drinks in a day and that is 60 espresso shots at approx 70ml a time (including rinse flush and water retention in the ground coffee), 20 Americanos at 250ml and 20 filter coffees at 500ml per time.
The glasswasher is stated at 2.2l per cycle and I would expect to run it about 5 times per day.
That's roughly 35l per day.
The cheap ebay systems are rated at 340l/day but I'm told realistically you should expect less than half of that - so if I had a 40l tank which would fill overnight, plus the system will still be generating at least 6l/hour during service, I should be right, right?
I don't expect that this conclusion is correct, but I want to know what £2.5k gets you over the £110 system.
Cheers