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Hi Virginia, I've done some research on tubs with jets, and from what I've read I wouldn't put anything granular in the water. The granules may damage your pump and also when the water stops some granules will be left in the pipes, where they will decompose and turn into.... well, I don't think it'll be nice.

try a plumbers shop as it is a whirlpool tub you state that it is a whirlpool tub then you say don't know what brand of tub it is whirlpool is a brand name any way the plumbers display of bathroom units and tubs will help you as the jets used are generic and not specific for the tub

Manuals and Troubleshooting Whirlpool whirlpool double door wiring Google Search

Is it a jetted tub, or a air bath tub with holes or jets in the floor? If it has holes or jets in the floor, the control box is bad and needs replaced. If it is a jetted tub, there may be a water level sensor, if so the sensor may be bad causing the tub to turn on.

Have you tried the button on the top ledge?

It is biofilm growing inside your plumbing. The black flakes are most likely biofilm. Check out specific cleaners designed to remove that crud. The best is called OH YUK

If the tub is more than 5 years old the rubber pump impeller could be disintegration.
If the debris just seems to be dirt then fill the tub above the intake with HOT water ... then add some dish washing detergent to the water ... run the pump about 1/2 to 1 hour

contact the company or set them before you turn it on

the best plave for you to get a diagram is wholsey.. tell them name brand and size of your tub. and they should be able to help you.

put your hand up under the edge of the button and push in the two plastic prongs in and push the switch up out of the spa they normally just push in and the prongs spring out to hold the switch in place

Probably control panel or if there are separate pumps for each side, that side's pump probably doesn't have a relay working with bad switch from the control panel.