How to use Reverse Osmosis for Maple Syrup

How to use Reverse Osmosis for Maple Syrup

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Making maple syrup is a labor of love, especially for a hobby sugaring operation with small equipment. Reverse osmosis is a process that can speed up syrup production by removing a significant amount of water from the sap before you put it in your evaporator.  This article goes over how to use reverse osmosis in a sugaring operation using a few different methods.

What is Reverse Osmosis?

Reverse Osmosis is a process typically used in water purification. According to Leader Evaporator, it is a process through which “a semi-permeable membrane is used to separate water from salt, sugar, minerals, and other impurities.” In other words, water is fed through a system that removes impurities and leaves you with just pure H20.

When we’re making maple syrup, reverse osmosis also leaves you with pure water, but what it removes is actually what we want to keep – highly concentrated sap.

What are the Benefits of Reverse Osmosis in Sugaring?

The whole point of boiling sap is to evaporate water and be left with a thick, sugary maple syrup. Maple syrup producers use an evaporator to boil the sap into syrup, and doing so can take quite a long time (read more about how to boil here). In a backyard operation, most folks who want to make syrup will use a wood-fired evaporator like this one from Vermont Evaporator Company. It works quite well, but we have found that we go through a ton of wood processing maple syrup every year.

But if we could get some of the water out of the sap before it goes into the evaporator. By using a reverse osmosis machine, we can eliminate 50% of the water in our sap before boiling, thus greatly reducing the amount of time it takes to go from sap to syrup. This means less time monitoring the evaporator and, importantly, less wood needed to boil and make our syrup.

Reverse Osmosis separates your sap into
highly concentrated sap (left) and pure water (right).

Reverse Osmosis Options for Backyard Syrup Makers

Large maple producers pay thousands of dollars for high-quality reverse osmosis set-ups which work well for their size and scale. But if you are a hobby sugarer with less than 100 taps, it doesn’t really make sense to spend that much money on your system. Luckily, there are other options for obtaining a reserve osmosis set-up.

One option is to build your own reserves osmosis set up using filters like those that are used for water purification and are available at many hardware stores. We won’t cover the full instructions for building your system in this article, but this set of instructions from Souly Rested offers great guidance on how to do so. Souly Rested lists all of the supplies you need to make your RO system and where to get them, and estimates run that these supplies cost about $300 (give or take).

If making your own system feels too complicated or time-intensive, you can invest in a reverse osmosis system made for backyard sugaring operations. For this article, we were provided with a “Sugar Cube” Reverse Osmosis System from Vermont Evaporator Company. The Sugar cube is an RO system built into a compact ammo box with handles so that you can move it around as needed. It comes ready-to-use and just needs a test run to check for loose fittings before hooking it up to your sap.

Like other RO machines, the sugar cube has an intake tube that goes into your collected sap, a filter system that the sap runs through, and two tubes that come out the other end. One of those tubes produced clean, clear water, and the other produces highly concentrated sap. Put them into two separate buckets and voila, you can cut the water content of your sap by up to 50%.

Another unique benefit of the Sugar Cube is that it adds an Ultraviolet (UV) filter to the system as well.  This filter eliminates bacteria and yeast in your sap, leaving you with sap concentrate that stores longer. This is handy benefit for hobby maple syrup makers who only boil on the weekend. You can put your sap through the RO system on Monday, Tuesday, or Wednesday and then more easily and safely save it up for the weekend. If the weather is going to be particularly warm, we can take this smaller amount of sap and pop it in a cooler or the fridge so it doesn’t warm up too much.

A pre-made RO system like the Sugar Cube can cost up to $500, but if you are going to use it over the course of many years, you’ll save that much in firewood and your time to make it worth it. Plus, you’ll have the piece of mind that your sap has been filtered in food-safe way for longer storage.

Watch our process using the Sugar Cube Reverse Osmosis system on 13 gallons of sap.

Is a Reverse Osmosis System Worth it for Hobby Syrup Makers?

We think a reverse osmosis system is a great investment for hobby syrup makers IF you are serious about making syrup more than once or twice a year. Since most backyard sugar makers use wood to boil their syrup, the savings on fuel by cutting your boiling time in half is huge. Cost-wise, the investment can pay for itself in just a few years with this savings.

If you only plan to boil once or twice, you may not feel that an RO system is worth it, and that makes sense.  For you, it is more about the “experience” than the production. For us, producing enough syrup to last the full year plus more for gifts is part of our priority.  We don’t want that syrup to end up costing us more than if we bought it from another sugaring operation. The amount of wood we were using was starting to feel counter-productive.

Likewise, as much as we love sitting outside by the evaporator with friends, there comes a point where 18 hours of boiling each weekend can feel cumbersome; getting to syrup faster is not a bad thing. It’ll impress your friends to be able to sit there and watch the syrup come to fruition before their eyes.

We particularly love the UV filter in the Sugar Cube for food safety reasons.  We don’t often have time to boil more than once a week. Knowing our sap has been filtered and is safe to use for longer helps us feel better about waiting until the weekend to boil. For that reason, it actually makes more sense for a backyard operation.

For more information on making syrup in your backyard, be sure to check out all of the articles in our series:

How to Clean Maple Sap Buckets

How to Tap a Maple Tree for Syrup

How to Collect & Store Sap for Maple Syrup

How to Boil Sap to Make Maple Syrup

How to Boil Sap More Efficiently

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Carrie Williams Howe
Blogger & Homesteader at The Happy Hive
Carrie Williams Howe is an educational leader by day and an aspiring homesteader by night and weekend. She lives on a small homestead in Vermont with her husband, two children, and a rambunctious border collie. She is a Founder and Editor of Homestead How-To and also blogs about her family's homestead life at The Happy Hive.


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