Hi, Thank you for choosing this HDX vac and for taking the time to post your review.
There are a couple of things you might look at regarding (lack of) suction during vacuuming.
The suction comes directly from the connection between the vacuum head and inlet (by way of spiral vacuum hose) and power provided by your pool pump.
Therefore we suggest
1. Be sure the spiral vacuum hose is fully primed with water so no air is getting in causing reduced suction and that it is placed securely into the skimmer inlet before vacuuming.
2. Be sure your filter is clean and pump basket empty before you begin to avoid any restrictions there.
We hope you find these suggestions helpful!