I think it about 10000 gallons plus filter chamber is 2200 gallon. But i want it total under 10000 gallon. About skimmer i think after build the wall it will block the skimmer. I have to build the new one. Steve i don't understand you mean Use a couple of waterway in wall gunite type skimmers in the new pond/filter dividing wall. Can you explain for me please?. about the filter system and skimmer. can i run all separate line to SC then go to JM then BIO then 2 pumps back to pond. I'm not doing anythings until i understand what I'm doing. also, i will draw my plan and get OK from experience people on this website.