Flowmeter size for homemade RO.

Yep - I think you will be happier with the higher throughput rate of that configuration and it won't cost you much more.

Good article on the details of reverse osmosis:
https://puretecwater.com/reverse-osm...everse-osmosis

Has a good diagram of the 2 stage set-up I was referring to:
Attachment 20326

Tapped 36 in Summit County yesterday the 15 day forecast looks good.

Quote:

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Originally Posted by jrgagne99

Does anyone know when the 400 gpd membranes arrived on the scene? I don't remember seeing them when I made my first RO system back in 2007. I believe 100 gpd was the max at that time. The 400's must use a different canister than the 150's right?

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Looks like the 400s use a 3 inch housing where the 150s use a 2 inch.

For what its worth, i use a system exactly like what the OP is showing. I run it at about 100 to 120 psi with 150 gpd membranes. My sap is usually about 1.5 to 1.75% and I can get it to almost 6% in one pass. Often during the week i will run the concentrate back into the holding tote and slowly get the whole batch to about 7.5 to 8%.