Hi @Jan and @ForbiddenTuna , i been had an awful lot of things going on last weeks, but its back in normal order now 
Cody’s right, it is 200 mesh, i wanted 400 but that wasn’t available in 10 meter lenght.
The volvo filter is probably 400 mesh, very fine.
Jan, I’ve had some missed calls from Jonas, and then i tried call him, and so on… i think im going to call him tomorrow, for some woodgas-talk 
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Thanks for the tip JO, going to check if it’s still there after the holidays
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Finally i modified my propane torch, so it will reach the nozzle through the air intake without going out.
A piece of copper pipe fit snugly on the torch nozzle.
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Welded some more reinforcements for the gasifier today, it hanged down a little, most because of the bumpy dirt road i prefer to drive to work.
No work of art, just scrap welded together, crossed/triangular is the strongest.
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Time for some service, last wednesday the gasifier started sneezing a lot on my way home from work, actually pretty fun when some other car follows a little to close
I’ve had leaks around hopper lid for a while now, time to fix it, the 70 years old asbestos rope seal has started to disintegrate, damn quality…
I grinded away about half of the old rope seal with a angle grinder, the reason i didn’t take it all out of the groove is im cheap, it saves about half the amount of rtv silicone
Cast-in-place silicone.
After drying 6 hours, final drying under pressure.
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If you allow me one comment regarding the lid seal,… I see that most gasifiers use a sealing groove at the top of the lid for opening, which is good, so that dirt does not accumulate, I did the opposite with Fergi and it works well, during operation, water and tar drain from the lid and this fills any leaks, interesting,… I did not foresee this, just luck in the manufacture…
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Hi Tone, yes, the opposite works well too, i used it for some time on my old volvo, but: in winter water and tar standing in the groove freezes, and makes the lid troublesome to open, i often had to use my poking rod as a pry bar to get it open.
The groove also may collect sawdust and sticks that forms kind of “reinforced” tar-ice.
Just some of my experiences
Oh, and another fun thing that happened with that volvo: once i lit the gasifier, and some curious people was standing to close, the gasifier “sneezed” “pffrrrrrtt” it sounded and it sprayed all the tarry water standing in the bottom groove, on the bystanders. 
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göran, a question not really to this topic…tone says probably hopper water can be used against lime incrustation in water tubings…i have this problem more often with our water from the well …have you some experience?or others know something about?
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Hi giorgio, i think it would probably work because it’s low PH, acidic, but what i think would be a problem is the unknown amounts of phenol and creosote, which is poisonous, i also think some wood species contain small amounts of poison in the bark, like cyanide? Which could be “distilled” to a dangerous concentration in the hopper.
I know hopper juice (when i accidentally soaked myself in it) has given me headache and skin rash.
I’ve read that Mikkonen in Finland make a small hole in a bale of hay, and pours the juice in it, the hay absorbs a lot of the tarry compounds, and a pretty clear solution drips out under the bale.
When the bale is saturated it’s useful for burning.
But that is probably not safe to use the clear stuff.
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You can buy food safe citric acid, then you circulate it through the pipes for several hours.
It doesn’t have to be fast, you just want the acid to react, and if I remember right you reverse the flow so any big chunks are going to a larger opening.
I dont know if a charcoal filter will pick up the calcium and magnesium that are clogging your pipes, but it might be worth googling a bit to find out.
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