Review on AG Industries Respironics Everflo Universal Compressor Filter - Enhanced Air Quality Solution by Brandon Bullard

Perfect for my Everflow oxygen concentrator which I bought used. REF 1020000. I had a two liter concentrator kit. Filter changed and consumption jumped to five liters. Do you think the old filter was a little dirty? The previous owner did not change the filter. Turned the concentrator down to two liters and inhaled cool, fresh oxygen. The filter I received is not transparent blue or gray. It is solid blue. See photo. I don't care as long as it fits and works.