Recently, I had to replace the foam inserts on my two AC 110's. With a weekly rinse out, they lasted a little over two years. I changed them 3 weeks apart not wanting to throw out all the good bacteria at the same time. I've noticed the replacements are different. They do not fit as tightly and look to be more porous. My wife commented that the tank is not as clear now. Has anyone else noticed a change in the inserts? Thanks for any replies.