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20 cups of coffee needs 2 cups of coffee grounds 30 cups of coffee needs 2 1/2 cups if grounds 40 cups of coffee needs 3 cups of grounds 45 cups of coffee needs 3 1/2 cups of grounds
1 cup brewed coffee = 5 fluid ounces * use standard measuring cups
There are 3 common causes of lost perk that can be dealt with at home, and cause about 1/2 of the failures with these urns. They are very common when the pots are used rarely or carelessly cleaned after use, and when coffee is ground too fine for perc (drip grind is too fine for perc). As long as the pot is still heating, check these three things: 1) Clean the _inside_ of the hollow stem )that holds the basket and moves the water from the bottom of the pot to the top), to remove all grounds. You should be able to see clearly through it. 2) At the bottom of this stem there is a very small cup that has little holes in it and fits into the little well at the bottom of the pot. Make sure these are completely clear. 3) Scour out the little well so all residue/ grounds are removed and the little cup fits perfectly into the well.
It is the perfect fit of the two that allows the perc-ing cycle to occur.
If the pot is not heating, or these cleaning measures do not work, a local electric repair shop can probably do the repair for about 1/2 the cost of a new urn.
If you have the L1350/155C, the manual states 1-1/4 cups coffee for 12 (5 oz) cups, for 30 cups use 3 cups coffee using standard measuring cups. Take the stem & filter out when the coffee has finished brewing so the bitter oils do not get into the coffee.
We use 'em every sunday at church - 1/2 cup grounds for every 10 cups water. Allowances: finer coffees will use less grounds, and the more you are making, the fewer grounds you need ( or vice versa- the less you are making, you may need to increase grounds a bit, as perk time will be shorter
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