Sterilizing jars? And related questions
9 years ago
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Sterilized Soil a Bad Idea?
Comments (15)Sorry, no. Sterile means sterile - the process of sterilization is intended to kill off any living organisms, pathogenic and benign. And I'd have to question the advisability of working with "alive soils" in any container growing situation. 'Alive' would connote the inclusion of your typical soil microorganisms and they need organic matter to survive. Including organic matter - like compost - in any sort of significant percentage as an ingredient in container/potting soil is not recommended. Most commercial potting soils contain little to no organic matter and are comprised almost entirely of relatively inert ingredients. The reason for this is that organic matter will continue to decay and breakdown over time into smaller and smaller particles. As this happens, your soil loses its porosity and ability to drain freely and plants suffer due to lack of adequate aeration and retained water. Potting soils with a high component of OM eventually (and more rapidly than you would expect) become a mucky, gooey, water-soaked mess....See MoreSterilizing tiny amount of soil in the microwave?
Comments (14)"lazygardens, my fear ("everything will die") is that I've read that you can microwave soil too long, and then anything you plant in it will die." Where did you read this? And what research backed it up? How would you go about sterilizing it with a pressure cooker? ... Pretend you are canning it, put it in a mason jar with a loose lid - get it to 15PSI and hold it there for 15 minutes. Let it cool naturally and you are done. Here is a link that might be useful: Pressure Cooker Sterilizing...See MoreConversion of 'All American - 25X sterilizer' to 'pressure canner
Comments (37)Ok, I had to chime in as I repair autoclaves for a living. With the RIGHT autoclave, sterility, safety, and flavor can be maximized. I have two Pelton Crane OCRs (10in diameter chamber,) one Midmark M9 (9in diameter chamber,) and one Tuttnauer 2540m (10in diameter chamber.) Of all the units I have used, the older Pelton Crane units seem to be the most viable for home canning, as I personally use them for this task. This autoclave uses a bellows to allow air in the chamber to be displaced by steam as the chamber heats up. It has a safety valve which will open in an over-pressure condition, usually at either 35 or 40 PSI. The analog temperature control is fully adjustable, regulated by a chamber steam temp sensor and TRIAC circuit. If you are worried about gauge accuracy, remember that there is a direct correlation between steam pressure and temperature. (See attached picture for a chart listing correlation points between temperature and pressure.) As long as the temp and pressure gauges correlate, it should be accurate. If you have doubts, a max register lag thermometer can be used to confirm the max temperature. If the max temp displayed on the thermometer matches what was shown on the gauge, and the temp and pressure gauges correlate, there is nothing to worry about. (If you are not running back to back cycles. More on this later.) When I am canning (or sterilizing liquid growth media or IV fluids) in it, I just run it at a lower temp for liquids, and only partially vent it at the end of the cycle to allow the water at the bottom of the chamber to exit. After the venting sound switches from water to steam bubbling through the condenser tube in the water reservoir, I allow the pressure to get down to about 5 PSI before closing the valve and allowing the unit to cool down naturally before opening the door. This will allow the pressure in the jars to come down some, and prevent exploding. This is mainly an issue if you are running cycles above 252F. For reference, pressure canning is usually done at 240F / 10.5 PSI, which is EASILY achievable in an autoclave. Lastly, when using an autoclave, you MUST remember to allow the unit to cool down enough for the bellows for it to open the chamber air vent valve. Failure to do this will cause air in the chamber to not be displaced by steam, leaving a space in the autoclave that DID NOT get up to temperature. -Adam Nash...See MoreQuestion about jarring
Comments (18)The great majority of home canners in the U.S. and Canada BWB jams and jellies. Most Europeans do not. It's not particularly a safety issue because you're dealing with a high-acid high-sugar product. However, shelf life can be reduced and there is a somewhat greater likelihood of mold. Jars with mold have to be discarded as a correlation between the mold and cancer has been found. It's your call. Not a big deal either way, though BWB is recommended by the USDA, Extension services, all standard sources (except for the pectin inserts, for some unknown reason). If you're referring to lemon juice in tomatoes, that is bottled lemon juice (i.e. ReaLemon) because the acidity is standardized. The alternative is powdered citric acid (which most feel has less effect on the flavor). It's commonly available in grocery stores/pharmacies or can be ordered online. Vinegar can also be used at 2x the amount of bottled lemon juice, but it does affect the flavor. I wouldn't use it for plain canned tomtoes. Rhubarb is much less acid than lemons and somewhat less acid than vinegar, so I don't see that as do-able. I hope this helps. Let us know if you have other questions. Carol...See More- 9 years ago
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