We have lint traps here, it is nothing more than a cement holding tank with the line running in, and a sepreate line running out, using the water as a p-trap. Some have screens between the enter and exit pipes to trap lint. My last mat they used a cement holding tank, may 200 gallons, it is deep, almost 6'. Ran the pipe in and down a little into the water, the exit pipe on the other side same way. I have it pumped every few years to get the crud out.
I have another trap at a different mat, it is about 4' deep, 5' long, 3' wide, and has thick screen across the middle.
I do not know what they cost, but am sure it is not $2700
Can you put in an outside lint trap??
if it was that easy everyone would do it..