Smitty Two wrote:

I was assuming that one filled the dispensers with powdered or liquid
detergent then flung a teaspoon or tablespoon of TSP into the bowels
of the machine. In so doing, the ratio would be 10:1 (or 30:1).

I don't own a dishwasher, other than the 1.5 machines that I own in
houses in which I do not live. I thought there was a reason for the
soap containers, to dispense soap at the proper time. Else why not
fling the entire allocation into the bowels of the machine?

One dispenser dumps its contents as you close the door. The other on the
subsequent wash cycle.

Not thinking on the project much, I had been broadcasting the TSP additive
into the machine just before closing the door which, of course, limited its
action to the first wash cycle.

UPDATE

To the process of adding TSP to your dishwashing detergent. The previous
method required measuring the quantity of detergent in a new box to
calculate the amount of TSP to add to obtain the proper ration (10:1 -
30:1).

You need not measure the amount of detergent that goes into the mixing bowl
cup-by-cup.

You can measure the box.

Multiply the length x width x height in inches to get the total cubic inches
of detergent. There are almost 0.07 cups per cubic inch. So, if you have a
box that's 10 x 3 x 10", you have 300 cubic inches of stuff or 300 x 0.07 =
21 cups.

For a 10:1 addition, add a scosch more than two cups of TSP to the mix.