With the bolt replacing the screw I would guess its full open I now have a GPM of 3.5
I have done a lot of calling around and I think I found a blue plastic Hydrocharger/ventur for about $60
SWT also has a plastic unit as well but still trying to get pricing http://www.swtwater.com/catalog/1215_air_injectors.htm
But as you first posted in its basic design a ventur will drop my GPM so maybe its better to look at a airpump method but then should I also look at a holding tank as well.
Take advantage of the extra GPM you have now, and do a manual backwash. If it doesn't run relatively clear by the end of the first one, do two or more.
The air needs contact time for best results. Bladder tanks are not usually used as precipitation tanks. Over time the iron may build up between the sides of the tank and the bladder.
Originally Posted by SimonT
Did a manual wash in to a bucket to look at water and it was pretty clear after 3rd 5Gal I put hose in the drain and then rocked and banged the side of treatment unit. But water was stil clear.
Water noise as it go's in tank is not so loud now as I guess water is not being forced through such a small opening.
Yer I read that for iron filters that use air the longer the water is held the better thats why a pressure tank is not so great.