I used my Gast aeration compressor/vacuum pump. First I put a test plug in the outlet of the siphon tube and then I drilled and tapped a PVC cap and installed a tire valve in it and put the cap on the end of the vent tube. I used electrical tape to seal the cap so it could be removed. I then connected a Whole House water filter with a clear base between the pump and the siphon cap so when water started being drawn to the vac. pump, I could close the valve on the filter. It took less than 3 minutes to draw the air out and fill 150 feet of 4" tubing. I then pulled the test plug from the outlet and was drenched by the rush of water being pulled from the pond. Once the pond level was lowered to the desired level, I pulled the cap off the vent tube and stopped the siphon.
I hope this makes some sense.
