Tag: maple sap

Maple Tapping

Instead of taps with a hook for a bucket (which seemed, to me, like it would put a lot of stress on the tree!), we use ratchet straps to hold our maple buckets. One end of the “S” is passed into the fabric loop that holds the other “S” — and that other “S” becomes our bucket hook. I like the bright orange straps because it makes finding trees in the woods very easy (bright white buckets look obvious too, but they can hide behind the tree).

Our first set of buckets has large holes drilled into the lids — which are great for larger trees with multiple taps. But the new buckets we bought this year have tube-sized holes to prevent rain from leaking into the bucket.

2023 Maple Season – First Sap Collection

We tapped trees for the last few days and have our first sap collection — thirteen five-gallon buckets (not completely full, but around 4.5 gallons per bucket … so not 65 gallons but at least 58.5 gallons) waiting to run through the reverse osmosis.

This year, our starting sap measured around 1.006-1.008 SG at around 50 degrees. The reverse osmosis is running at just under 100 psi (at 100 psi, we are not getting any sugar water out). The output sugar water is measuring at 1.022 … which is 3.7 times as concentrated as before we filtered the sap.

The flow rate is about a gallon every ten minutes, or six gallons an hour.

Maple Sap Reverse Osmosis

Since I had the reverse osmosis system laid out for assembly, I figured I could take a picture to show how the filters are connected in series. Each filter “cleans” water out of the maple sap — that water is fed into a common output tube where we collect gallons of water (the clean water output lines are removed here so we can see the path maple sap travels, ignoring the clean water). We use this water for rinsing sappy stuff as we collect, filter, and boil the sap … also water we drink, bring out to the chickens and turkeys, give the cat, dump in the washer.

The “dirty stuff” that normally gets discarded? That’s the concentrated sap — each filter’s “dirty stuff” line is connected to the input of the next filter. Which then “cleans” more water from the sap and passes the “dirty stuff” down the line.

The maple “setup” is the reverse of the “drinking water” setup — below — where the “dirty stuff” goes to a common drain line for disposal and the clean water is sent to the input of the next filter for farther cleaning.

2022 Maple Season

Well, the 2022 maple season is over — I think our taps have dried up because we’ve had a few freeze/thaw days and haven’t really yielded an appreciable amount of sap. We only got like 2.5 gallons of syrup this year — much less than expected … and we need to be ready to tap in January next year when the first week of freeze/thaw hits. While I love the flavor of late-season syrup, we’re getting way too many warm days in March for good sap production.

Reverse Osmosis Maple Sap Stats

We collected nine gallons of sap with SG of 1.009 = 2.3 Brix

We ran all of the sap through the reverse osmosis system at 60psi and had sap with SG 1.011 = 2.8 Brix

We ran the concentrated sap through the reverse osmosis system a second time, this time at 80psi and had sap with SG 1.022 = 5.6 Brix.

The “pure water” output SG was about 1.003 — we re-ran this through the RO as well.

At the end of the day, we have about 4 gallons of sap at 5.6% sugar, another gallon from the “pure water” run that’s a lower SG, and four gallons of water that’s removed.

Notes for the future:

  • We want to see what a single pass at higher pressure does — is it multiple passes that farther concentrated the sap or the higher pressure?
  • We took SG readings and converted to brix using an online converter. Next time, we should just take the readings in Brix 🙂
  • We might need a different refractometer to get accurate readings near 1 … not sure how accurate our tool is at the low end of the range.