Good morning....I recently installed an UltraTemp 140. I have a Pentair Sand Dollar Filter. I noticed after install that my pressure was close to 20 and just chalked it up to needing a backwash. Typically after a backwash I am in the 11 range. I just backwashed and am still hovering around 15-16. Would the heat pump cause the normal pressure to elevate 4-5 psi?