OASE PondoVac 4 Pond Vacuum ph up & down it has a 1-point auto

it has a 1-point auto calibration feature which makes it easy to calibrate

This product lowers nutrient pH

The extractor is speed controllable using voltage or frequency control

All you need to do is apply approximately 1/2″- 3/4″ thick layer of Gnat Nix

OASE PondoVac 4 Pond Vacuum ph up & down it has a 1-point autoThe PondoVac 4 can vacuum up to 5000 L H without interruption. It can be used continuously and powerfully in garden ponds, pools and swimming ponds, and as a wet vacuum in the home. This is made possible by the patented dual chamber system, which allows the vacuum to be used whilst the container is being emptied. A transparent pipe allows convenient flow control; the carrying handle, transport rollers and suction pipe holder also allow easy handling.