who uses this membrane please what is water production like my water is around 170 tds out the tap
Similar TDS to mine.
I've had my HF5 a few years now. It still churns out water at 008 TDS. I've looked after it. I turn waste full on once or twice a week for at least 10 minutes. I ensure the the 20" pre filters are changed three times a year. I only use about 2,000 to 3,000 litres a week though (depends what sort of work I have on).
The last time I checked (ages ago), production rate was about 75 litres an hour at 35 - 40PSI. That's lower than many quote but I'm not bothered as it does me with room to spare. That would give 1800 litres a day so might be OK for you if you stagger when the van fill up of if you have spare IBC capacity to fill over the weekend.
Many say they get a lot more than 75 litres per hour.