This product in not for unstopping drains. You will need to clear out your drain first, use a hand pump such as a bicycle tire pump, or even a small air compressor and blow it out. The tablets are to keep any build up of algae or such, put one or two tables in the pan to help keep it clear, A couple of time during a/c season. Also when you open up the drain line make sure you pour water in the pan and flush out the drain pan and drain line.
This really isn't for use in a refrigerator. Their drain pans work on evaporation on heat from the compressor.
PanTabs are meant to be used in air conditioners where the drain lines are always wet. It stops mold, algae and fungus forming in these lines. In your application, a pool cleaner like Algicide 20% might be better when diluted per directions and drenched in the pad. You might also try soaking the pad in a 50% vinegar solution about once a month.
No. Put the tablets in the drain line and in the water collection area of the air conditioner.
In its drip pan, yes.
As long as there is something to prevent them getting sucked into the pump inlet.
I am not sure they work for a washer drain since buildup of materials and substances other that algae need to be considered.
They do kill algae. According to the MSDS they contain dimethyl benzyl ammonium chloride, a non-toxic salt, which cannot activate a chlorine sensitivity. They should work in evaporative coolers but might dissolve faster due to the higher water exposure than other applications.
yes they can ,may need to be cut in half to fit is a window a/c.
I use at every filter changed (every 30days) during the hot Texas summer.