We have some really great 'techy' type guys here who are, as they have been exploring the FD mechanics and sharing that in their posts, writing what is turning out to be a 'troubleshooting manual' for us less capable folks.
However, manufacturers usually sell their products online or through resellers, so a manufacturer having a physical store is rare.
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The only way I know to filter the water vapor out would be a cold trap. They usually use liquid nitrogen or dry ice to keep the temperature low enough that all the water condenses out. Obviously you would need a supply of the liquid nitrogen or dry ice that would probably not be cost effective for most of us. The other option to get that cold would be to use a cryocooler and build a cold trap around it. It could be done, but would be pretty expensive. I've been watching some electronics on ebay that have cryocoolers in them, but the cheapest I've seen is around $600. Still not a cheap option, but you wouldn't need dry ice or liquid nitrogen to feed it.
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The most popular variety is Bartlett pears available the first two weeks in September in Utah. If they are to be transported or not processed immediately, pick while slightly green and allow them to ripen in a cool, dark place.
One of the many joys of having a working freezer is the potential that website it holds. While cooking may not be everyone’s forte, saving time usually is, and this is one of the benefits a freezer affords. By scheduling particular days and reserving them exclusively for the preparation of a week’s worth of meals, you’ll save not only a significant amount of money, but time.
A bit of background on me - I used to work in a sold state fabrication lab (university research lab) and had a lot of hands-on work with ultra-high vacuum equipment. The pumping we do for freeze drying was what was required to just start
You can determine when the product is dry by feel or by calculation of the amount of water remaining in the product.
AN8 male fittings are 3/4 X 16tpi. Should be able to get one that will work in this application. Also, there filters that use metric threads, might be easier to deal with.
Now that I've filled you in on why the most affordable freeze dryer is the small Harvest Right, let's talk about how you can score one without breaking the bank.
I want to suggest to Teppy that you get a bunch of 8 quart hard plastic foodsaver containers to keep your products in under vacuum, being so low in moisture they attract water and soften rather easily. E-bay is a good source.
Learn how to safely preserve tomatoes through a variety of methods, such as canning, freezing and other methods. Also find recipes to use while preserving tomatoes, such as tomato juice or tomato sauces.
Forgive me for the extremely long post but I thought other southerners may also face this problem and could use this information.