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These worked well and were easy to assemble and use!
I have purchased grolsch style bottles at a different website and they in no way compare to the quality bottles Cultures for Health sells. The other bottles didn’t seal enough to make the water kefir. Culture for Health bottles are the best!
I like to put water kefir through a second ferment to give it a flavor and make it fizzy. It never seemed to work with mason jars even with the lid sealed tightly. The second ferment is turning out very fizzy with these bottles! I think the others were just not airtight. I am pleased with the thickness of the glass and durability of the bottles. I hope to keep using them for many, many years.
I am using these bottles for water kefir and they work great. I am getting fantastic carbonation. Two bottles are just right for a quart of kefir.
These have worked great for bottling my kombucha. I recommend them.