i have a hayward s240 sand filter and it has always run around 14 psi if backwashing not needed - well this year i crank things up and backwash but my pressure is 20 in filter setting - backwash and all other settings are around 14 like normal but i cant figure out why my pressure is up - i replaced sand year before last and i even tried the sand cleaner stuff yesterday - i am afraid to leave it running since its higher and was thinking if its something with the sand - i plan to vacuum out the sand and replace with that zeosand stuff but its pricy - anyone have any suggestions - i dont think its the gauge - anyone know if the zeosand will run lower pressures ? than the sand maybe and have just as good of flow and filtration - i may have put too much sand in it when i replaced the sand but still i have never had a 20 pressure except when it needed backwashing really bad - where is the cheapest place for this zeosand ? thanks