absolutely! And if I sent one of my guys or I was doing it myself, I would have pulled down the whole lowside. Why???? There was moisture indicated in the system. Why not try to see why. If we pump down the liquid and change the dryer we can't do anything about possible moisture in the high side, but I sure could have made sure it was out of the low and maybe found there was a leak. Also, the filter will catch and hold that moisture until it is saturated, so the sight glass tells us it is not absorbing anymore. We got a lot of moisture in this system. At least get all you can from the low and check for leaks, and give youir new filter a chance at being able to catch and hold the rest. And, just because moisture is caught in the filter, does not mean that moisture has no effect on the system.