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4 x 40GPD?
or...
4 x 40"?

Advised to dilute 50ml Caustic Soda into 5L/1G water, then add (gradually) to 50L/10G, I decided to be cautious and go with 30ml instead as my membranes were very new and had only been doing RO runs...

Not sure if this is useful or not, but I successfully used a TDS meter as a guide for sugar % - My Sap (Birch) sat around 360ppm fresh, and around 580ppm after one pass.
It kept relatively steady...

Thanks for pointing that out, my typo, have edited post.

Thanks for the replies, all.

I seem to have an RO system that is larger than most homemade ones. Most homemade ones seem to use 10" canisters. The membranes on the PRF-RO are 3"x18" and are rated...

Updates after speaking to a pump & RO specialist in the UK (Vyair.co.uk)

I learnt a large amount from this phone call...

I'm glad I didn't buy a Z-chen 400GPD, as it needs apx 7m of head height...

I'm very new to this, but did you flush out the entire rig before storage?
I don't think these things like frozen water ANYwhere near them...Ice expands... you might have sprung a leak or lost a...

I'm dealing with an all in one unit (The Pentair PRF-RO), membranes are rated at 350 each (2 membranes, 1 pre-filter - I am also installing a 5 micron filter after the pump and before the RO),...

:( buying a new RO system right as the season begins is a hurdle I didn't think I had to cross.
It's almost cost me the whole season and I have very little else.
Fortunately I have found another...

I'm a little confused about pairing the right pump GPD with an RO unit's GPD, can anyone help as I need to make an order by the end of the day...

My RO unit is capable of producing around 700GPD,...

Permeate came out at 0% Brix, but 31TDS.
this was when it was RO'ed without back pressure, but I've found that when I apply back pressure (restricting flow to apx 50%) my RO housing is cracked, and...

Not currently, but I'm looking into back pressure on the concentrate line - a simple half opened tap or better: a flow restrictor, just figuring out which size flow restrictor would work for my setup.

Reliably reading 0.6 Brix fresh from the tree, as I've not fully run a batch - I don't know what it comes out at once, twice, or thrice RO'ed, the RO states that at optimal temperatures/pressures it...

I have a rather pressing issue on site, my RO system isn't producing enough to get a batch of sap ready for boiling.

I am running 1000L tanks (currently only collecting 200L/day) into a Pentair...

Greetings all from the windy, wet and beautiful United Kingdom (Yeah, yeah, Brexit...)

Anyway. Brief intro before I bring up my RO issue:

I've been tapping Birch personally for around 20 years,...