My new skimmer is not producing any foam or not collecting any skimmate in the collection cup?

All skimmers require a break in period before any stable formation of foam will be made or start rising within the neck of the skimmer. This process can take up to 4 weeks especially with smaller systems. When first starting your new skimmer set the water level in the skimmer low by keeping the outlet valve on the open side. If your worried about it overflowing when your not present leave the valve completely open. Do not attempt to raise the water level in the skimmer for at least 3-4 weeks or you will run the risk of the skimmer overflowing and flooding the surrounding area. Please be patient during this break in period. Your skimmer is working but it needs to run for some time to allow all residual oils on the acrylic from production and handling to break down before it will build a steady head of foam. Rinsing the pump in a solution of vinegar and water and Running fresh activated carbon may help with the break in cycle. Low salinity levels has an effect on air induction and suggest a reading of 1.024-1.026 for optimal air intake. If the system is new as well their may be little organics for the skimmer to collect as well. Patience is the key.