Reply To: Grey Water Tank Needed Home › Forums › Discussion Forum › Grey Water Tank Needed › Reply To: Grey Water Tank Needed December 29, 2016 at 2:27 pm #700 Steve WoodsParticipant Thank you Steve Thomsen. They do seem to be brittle. Do you happen to know the material they are made of? I’m considering fiberglass and a piece of metal window screen as a strengthener. This reply was modified 3 years, 8 months ago by Steve Woods.