What happens when you combine a Soviet EO-65K filter with a Polish EO-14 filter, as well as a P3 filter pad in the GOST hose intake. You get the Ultimate Soviet filter, ridiculously heavy, ridiculously bulky and it looks stupid and you can barely breathe, but it offers a lot of filtering power.
I tested it on an Polish OM-14/ShM-41 respirator and the results were satisfactory, I used Phosphorous liquid fertiliser as the smell of that stuff will instantly cause a strong reaction.
I then tested the same mask with a Hungarian PMG EO-18K filter (an oversized GP-5 filter) and the results were still pleasing.
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