Hello - I have a Pentair VS+SVRS pump and a Pentair cartridge clear and clean plus 520 and when running the pump on low speed (1100 rpm), I am getting near zero head pressure. The person with the builder that helped startup the pool said he always likes to see at least 10 psiand suggested running it faster. I am running the pump on high for 2 hours per day which gives me almost 1 turn on the water and then 1100 rpm for 8 hours to keep the swg working. Why would I ever want more pressure? There is still water coming out of all the jets and it will even make the waterfalls trickle if I wanted. Running the pump on low if about 140 watts, running on high is about 2400 watts (17 times increase) with an estimated increase in water flow of 6-7 times. I estimated these flow rates based on others post in the forum.