@duraleigh - I guess I used the wrong term for "head"(multiport valve). The original one cracked. The old one ran between 8-10 psi, this one 16-18. What would explain this jump? So, in my mind, the pressure gauge is off or the pressure is awfully high. I cleaned the sand after changing the valve but it didn't lower the pressure. I can try it again.
@richard - From this forum, I believe the term is POP. I have it, my kids don't. lol. As far as bad DPD, I just ordered the kit 2 weeks ago. So, I would think the powder is good.
I will continue the fight. Trouble free days ahead, I hope.