Upon arrival to the location, we met Jason who took us inside and mentioned the hammer arrestor is back to causing banging noises. It wasn’t immediately after I installed it a couple months ago but he mentioned ago 2 weeks or so. Moreover, I checked the toilet, and it was making the hammering, I did not have another one in the truck but I got it delivered. We installed the new one and all is working well at the moment. He mentioned the filtration being 18 months old without being changed. So I gave him an estimate for changing them which he approved.