Gunnite, or block for new pond

[James P]

Kerry, 7500 gallons and one drain? What is your turn over rate? JR

[dick benbow]

hey Kerry, Welcome to the board. Like JR, I'd like to learn a little bit more about your pond. How long it's been in operation. the amount of fish you keep etc.

[KERRY THE SPRAY GUY]

i have a twister vortex,the bigger fluidart challenger filter,and turn my water about every hour.i have 16 fish withe biggest one about 24 in.have the pond 1 year

[James P]

Thanks Kerry. See that is the part that confuses me? You have 7500 gallons of water and one bottom drain. And I assume your pump is in front of the big bubble bead? How can you get 7500 gallons through that pipe ( what size is your drain pipe and how long is the run?) and past the resistance offered to the pump by the bubble bead? JR

[KERRY THE SPRAY GUY]

bottom drain is 4in. pipe to the vortex,then 2in. to the pump.distance(to pump 25ft.)skimmer line to pump is 2 in. and about 30 ft.pump pulls 90% of its water from the skimmer and 10% from the vortex.system is gravity feed.my water is crystal clear and never have had to use chemicals to keep it that way.also have never had any water problems.i do a 5% to 10% water change about every 10 days but as the fish get bigger will have to do that about every 7 days.last year in 3 months my fish at least doubled in size!!!!!

[James P]

So Kerry you realize that water turnover means that amount of water that goes through a biological filter per hour? I think you have considerably less turn over than you think unless I'm not understanding your system yet? What pump are you using again? JR