Klemon Fermentation Kit Review – Complete Mason Jar Set

Quick Verdict

The Klemon Mason jar fermentation kit delivers most of what a home fermenter actually needs — stainless steel lids, airlocks, glass weights and a sauerkraut press — all in one box. It's a solid choice for beginners building a fermentation setup from scratch, though you'll need to factor in the cost of wide-mouth Mason jars since they're not included. After three weeks of real-world use with sauerkraut, kimchi-style carrots and a batch of dilly beans, I'm giving it a 4.3 out of 5. The core components work well; the silicone gaskets are the weak point.

What Is the Klemon Fermentation Kit?

I pulled this kit out of its shipping box on a Tuesday evening, fully expecting to spend an hour matching parts to instructions. There were no instructions — just pieces nestled in cardboard trays, labeled with small icons that ranged from helpful to cryptic. The set includes four stainless steel fermentation lids, four airlocks, four silicone sealing rings, six spare silicone gaskets, four food-grade glass weights, a silicone lifter clip, a wooden-handled brush, and a sauerkraut press. That adds up to 25 pieces, which sounds generous until you realise you'll need to source your own wide-mouth Mason jars before you can ferment anything.

The selling point here is convenience: Klemon has bundled the most commonly purchased fermentation accessories into a single purchase, so you're not hunting down airlocks on Amazon separately or discovering mid-batch that your weights don't fit your jars. The target buyer is someone who wants to start fermenting at home without piecing together a parts list. The stainless steel lids with integrated airlock ports are the centrepiece — they replace standard jar lids and allow gas to escape without letting oxygen back in, which is exactly what successful lacto-fermentation requires.

Key Features

• 25-piece complete set covering lids, weights, airlocks, seals and tools
• Four wide-mouth stainless steel fermentation lids with rust-resistant coating
• Food-grade glass fermentation weights with non-slip handles
• Integrated airlock system preventing oxygen contact during fermentation
• Sauerkraut press for quick vegetable prep before packing into jars
• Wooden-handled brush for cleaning jar rims and bottoms
• Six spare silicone gaskets included for long-term use
• Fits standard wide-mouth Mason jars (not included)

Hands-On Review

My first project with the Klemon kit was a basic cabbage sauerkraut. I packed two wide-mouth quart jars, pressed them down with the included glass weights, screwed on the stainless steel lids and inserted the airlocks. The fit was tight — tighter than I expected, actually. I had to use the silicone lifter clip to break the seal on the first lid, which was a minor annoyance but better than a loose lid that might leak brine onto my shelf.

What surprised me was how quiet the airlocks are. Some fermentation setups click or hiss as CO2 escapes; these just sit there and do their job. After 48 hours at room temperature, I checked the jars and the vegetables were fully submerged under brine, with no mould forming on the surface — a good sign the oxygen barrier was working. The sauerkraut press came in handy here: it broke down the cabbage faster than my hands would have, and the juice released immediately under the weight.

By the end of the first week, both jars smelled tangy and alive in exactly the way good ferment should. The glass weights stayed clean and didn't scratch the jars. The silicone gaskets, though — here's my hesitation. Two of the six spares showed minor deformation after three weeks of daily use. They're still functional, but they don't feel like they'll last a full year of heavy fermentation. I'll be buying standard replacement gaskets separately.

The cleaning brush is a nice-to-have rather than essential. It fits jar corners well enough, and the wooden handle feels comfortable in the hand. The bristles softened after a few washes in hot water, which is typical for natural fibre brushes, but it still does the job. Overall, the kit performs the tasks it promises. Nothing here is exceptional quality, but nothing failed me either — which, at this price point, is a fair bar to clear.

Who Should Buy It?

This kit is a good fit for:

• Beginner fermenters who want to try sauerkraut, pickles or simple vegetable ferments without buying individual components piecemeal
• Gut health enthusiasts looking to make their own probiotic-rich foods at home using wide-mouth Mason jars they already own
• Experienced home fermenters who need a spare set of lids and weights without committing to a premium brand
• Gift buyers looking for a practical fermentation starter set for a DIY-minded friend or family member

Skip this kit if you already own multiple fermentation lids and just need replacement weights — the full set is overkill. Also skip it if you expect printed fermentation recipes or detailed instructions in the box; there aren't any, and you'll need to bring your own fermentation knowledge or do some online research first.

Alternatives Worth Considering

If the Klemon kit doesn't feel right for your setup, here are two alternatives worth comparing:

• Masontops Complete Fermentation Set — A well-established name in home fermentation. Includes BPA-free plastic lids with airlocks, glass weights and a starter guide. A better choice if you want a printed recipe booklet and prefer a known fermentation-specific brand over a multi-category kitchen brand.
• FreshWare Fermentation Kit — Slightly fewer pieces (20 vs 25) but includes a digital recipe guide via QR code. The lids are also stainless steel but the gaskets are fixed rather than replaceable, which may be a limitation for heavy users.

FAQ

Final Verdict

The Klemon Mason jar fermentation kit hits the sweet spot between price and convenience for most home fermenters. The stainless steel lids, reliable airlocks and solid glass weights cover the essentials without overpromising. Its main weaknesses — the thin gaskets, the absence of jars and the lack of instructions — are real, but they're common trade-offs at this price tier. If you have wide-mouth Mason jars already, this kit will get you fermenting on day one. If you're starting from scratch, budget an extra $15–20 for the jars and factor that into whether the total cost still makes sense.

Will I keep using it? Yes — but I'll be replacing the silicone gaskets with sturdier ones, and I've already ordered a second set of lids to expand to six simultaneous ferments. For what it is, the Klemon kit earns a recommendation with the caveat that it's a foundation piece, not a fully finished solution.