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From the description , it looks like an episode of "ropey".
Any warm spell at the end of the season ? Producing how long with same prefilter ? prefilter monitoring ?
Refer to your membrane...

I know sugar sand is an inevitable thing.
I boil concentrate at 6 brix , and mid season , after a 2 hours boil,
by the touch of a spoon you can feel the sand buildup on the bottom of the pan.
The...

The internal diameter of the needle valve might be so small that even when fully open a restriction is applied
on the membrane generating that residual pressure.
If you feel like it , you could...

Like my old mother says ....there is always two side on a coin .
I am cooking on a 2x6 that evaporates 25 gallons an hour with 200 taps on 3/16 and a 250 gallons sap tank.
The 4x40 RO with a...

Maple sap contains a good population of bacteria , among them the family lactobacillus ans the genus leuconostoc.
They are always present to some extend , but conditions like a rise in temperature...

An acid wash should always be performed after a soap NAOH wash.
The soap wash will remove organic matters , and the acid will remove mineral deposit.
Performing an acid wash without removing...

For a 4x40 membrane the specs will usually specify a max feed flow rate of about 16gpm or 960gph which is related to the possible "mechanical/integrity" damage to the membrane structure if feed over...

200 GPH at 15 % recovery gives you 30 gallons an hour of permeate and 170 GPH on the concentrate side.
170 GPH or 2.8 GPM on the concentrate side is not much , a 4X 40 usually requires 4GPM .
Make...

Hi folks , hang on , spring is coming !!!
So far a good snow cover to protect from freezing too deep

I live in a region where sugar sand is a problem , after only a four hours of boiling it...

I am in a continuous learning process, and as i see it , it is gone take me life to learn living !!!

A positive displacement pump is designed to build pressure. It does that by physically...

Passive recirculation or poor,s man recirculation as sometimes described on the post , is plumbing a recirculation loop outside of the pressure loop ( tee,s out after the valve and tee's in before...

Ok now i understand .
Mine is a passive recirculation
Yours would be plumbed within the pressure loop ( after the pump)
Question for you Walk, when you do that , do you have to push within the...

I'm not sure if you are finally using a procon 330.
With 2 4X40 in series , you will push 330 through the first one , about 40 gph will permeate ,
290 will be pushed through the second one ,...

Thanks for sharing
After many second thoughts ...each 2.5 feets of elevation gives about 1 psi so
it should not be a concern , and the new set up should be fine
Have a great season

Hi folks
Need your input on this one
I have never seen someone on the forum raising this as a concern but .....
I have plumb a recirculation line on my 4X40 , it is tee in between the filter and...

I would say you need both
Reverse osmosis is all about pressure over the osmotic pressure !
More pressure gives you the flexibility to handle colder sap, and still be efficient as the brix of
the...

Does your motor has the flexibility to be wired on 240 ?
It will draw about 5 amps and should not be a problem on 75 ft of 12 gauge

This is how we are set up
A single 4x40 with a procon 330 and a 3/4 hp
Operation pressure is between 135 and 180 ( temperature and brix related)
Water removal is about 45 gallons an hour (permeate...

Once Pressure created by the closure of the restriction valve is over the force of osmotic pressure , permeate flow is initiated.
Over a certain maximum pressure ........fouling is initiated !!!!...

Two 40-40 will make a nice set up
Do you plan to plumb paralell or in series ?
1/2 HP is within spec ?
From my experience a 3/4HP with a procon 330 and one 40-40 delivers the 330 gpm but
does...

Thanks folks ,really appreciate the info
Last year my 4X40 did OK
But for next year i would like to plumb a recirculation loop to match
my evaporator at 30 gph at whatever brix i get .
I use to...

Thanks a lot for the schematics , this is what i am plumbing.
Could you send me the specs / links of the valves on the upper cap schematics , specially the needle valve with 5/16 internal bore...

Hi folks
I have almost everything i need to plumb a poor man recirculation loop on my
single 4X40 post , but the needle valve still confuse me !!!!
Could someone tell me what they have use as...

I try to adhere to the keep it as simple as possible principle.
If you can mount the pump at the base of the unit so that sap level in your container would be 2 feet above or more
a booster pump...

Good afternoon

Have a look at this post.

http://mapletrader.com/community/showthread.php?25884-Help-me-Design-our-RO

This is a nice unit that can eventually do good for you
The pump is...