Siphoning again! What am I doing wrong?

9 years ago

The other siphoning thread has a lot of stuff about changing headspace on it, figured I'd start a new one.

Presto 18qt this time, 50332 weight set. I PCed 4 quarts of strained tomato juice (put through Victorio, then through mesh strainer, boiled on stove before filling jars). There might have been a few teeny red specks in the canner water (3 qts) after PCing for 17 minutes (added 2 minutes to be safe, we're at 997ft to the foundation) at 10psig. I figured I was golden - the weight set never stopped rocking, I had the burner set to High (10) to heat the water and the jars, turned it to Off when it started boiling, filled the jars, and then turned it to 8 and left it there through the 10 minute vent, coming to pressure, 17 min processing time, then of course turned it Off when time was complete, after depressurization and the lid lock dropped I removed the weight, then opened the lid, waited 10 more minutes to remove the jars. HS was 1" following Ball Complete instructions for Tomato Juice. Of course I acidified - 1/2tsp CA per quart.

I reduced the strained solids (mixed with more tomatoes I milled and didn't strain) by about 1/3 for what I thought was "thin" sauce per NCHFP. Same procedure except this time I left 3/4" HS b/c I was not sure whether Ball 1" was correct or I should go with NCHFP (which says 1/2" for juice and 1/4" for sauce). I think every jar siphoned b/c the water was yellowish and I have tomato gunk around the threads and down the sides of the jars. I did add a little water to the canner, maybe a pint at most, to replace what evaporated (vented) while doing the juice. It did seem to be a little low when I opened the canner after PCing the sauce. Maybe I should have dumped the water out after that batch and refilled after measuring 3 qts per the manual.

So did my sauce siphon b/c I had too much (or too little, according to Ball Complete) HS? Because the sauce was thicker? B/c I had too little water in the canner? B/c my glass top burner cycles, even though I didn't touch the control and the weight/pressure stayed over 10 psi (11 by gauge, I do think I saw it hit 12 at one point)?

I just took the rings off, even the quarts of juice seemed a little sticky so they probably siphoned too, just the clear stuff not the pulp.

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Comments (6)

pixie_lou
9 years ago
FWIW - I also have a glass top stove. When my time is done, I just turn off the burner and leave the pot on the burner to cool down. I've found that if I slide the pot off the burner, I get siphoning. Which I have personally attributed to a rapid drop in pressure.

Granted I use a dial gauge. Once I'm up to pressure, I turn my burner down to about 2. 2 keeps it at pressure.
2ajsmama
Original Author
9 years ago
I left the PC on the burner, I didn't want to slide it and scratch the stove.

You don't get siphoning turning the heat down after it's at pressure? I thought that was a major cause of siphoning - my thread from last fall I said I was at 7 and turned down to 6.5, Dave told me that likely caused it.
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2ajsmama
Original Author
9 years ago
Ugh! I don't remember what I was doing last fall, or even with the juice last night, but I do remember with the sauce I took the lid off as soon as I took the weight off (after lid lock dropped), THEN left the jars in 10 minutes! Got confused with BWBing I guess when you take the lid off and then leave the jars in the water.

From NCHFP:

"After the canner is completely depressurized, remove the weight from the vent pipe or open the petcock. Wait 10 minutes; then unfasten the lid and remove it carefully. Lift the lid with the underside away from you so that the steam coming out of the canner does not burn your face."

Whose HS recommendations should I use in the future though - Ball Complete or NCHFP? I can't believe they're so different!
gardengrl
9 years ago
I always defer to more HS than less when pressure canning. I've never PC'd anything that needed less than 1" for HS.

As far as after processing, yes the NCHFP site is correct to remove the weight and wait 10 minutes before removing the lid. FWIW, my Ball Complete Book of Home Preserving does say to remove the weight and wait 10 minutes too.

I also have a glass top stove and I move my canner off the burner to a cool burner and don't have issues with siphoning. I think siphoning mostly comes from not enough HS and a rapid decrease in temps. If you continue to have problems, next time remove the weight and wait 10 minutes, remove the lid and wait another 10 minutes before removing the jars.
eddie1025
9 years ago
It might be the burner cycling. Do you have a friend with a gas stove that would allow you to experiment a few times?

It really shouldn't matter if you have the heat cranked since the weights will just vent the extra pressure and the temperature should remain the same. However, I do wonder if all the furious boiling water might be jiggling the jars too much. Could the jars be giggling enough to splash the contents up on the lid?
2ajsmama
Original Author
9 years ago
I don't know anyone with gas - I bought a camp stove earlier this summer and haven't taken it out of the box yet. I'm pretty sure the siphoning this time was from taking the lid off too soon. But I'll try setting the heat a little lower next time.