Yeah i understand the process of all your statements. I understood them before in previous posts. It was $12 and works great in my opinion. I have it in about 8' in my pond and it churns the water and creates a clearing in the pond of about 20' in diameter as the duck weed is not in that area. As for the maintenance of the membrane... If I cant clean the membrane i can just build a new set up for 15$ including the membrane. I guess the pictures of the membrane itself are misleading as well. The bubbles coming out under water are super fine. Thats why i dropped it in the pool to check the bubble size. They seem to be as small or smaller that what a fish tank air stone would produce. I dont have a 70 dollar vertex to compare and now that i have this i wll never. Dang where are all the ...'' thats a great set up for a cheap price'' ... quotes out.
