Water requirements for NHHD?

Hello Dr John,
Have been following your web site for a few years now, though I am not on dialysis yet but very close. eGFR 11.
Water is a big issue where I live. So I was wondering if you can tell me what blood flow rate is typically used for a Night Home Hemodialysis of 7-8 hrs/night for 5 nights /week, and therefore what might therefore be the typical dialysate flow rate for this blood flow. I have read somewhere that dialysate flow rate needs too be 1.5 times blood flow rate at least. Is this correct?
It has also been indicated to me that NHHD requires far smaller blood flow rates than the usual 500ml/min and, I am hoping, a smaller water flow rate as well.
Look forward to your reply,
Paul Cruice