Ok multiport valve "closed" I got 11 - 12 psi. So that's all the psi the intex has got. So in reality, Ive got 6psi clean, and 10-11 psi when i need to backwash. So my pressure climbs almost 100% and when I backwash, it does turn grey then clear about 2 min later.
In the end, if I have to backwash once a day, it still beats the heck outta washing those cartridges once or twice a day, and except for the water and salt, no cost. My pool is SO CRAZY CLEAR now compared to before, that 2min a day backwashing I think I can live with.
As for the sand, it is pool filter sand. The only question is how much as the bags said .5cuft instead of weight. I use 50lb bags of concrete(not 80) everyday. These bags of sand were not that heavy...garaunteed. But I have a mud hole next to my equipment, that I need sand for. I will buy a couple of these bags for that purpose and weigh them for GP to see how much sand is in the filter, but from my estimate of weight of bags, and how much I got on the ground, I'm betting almost a perfect 200#. I'd say give or take no more than 15# either way.
Oh and the pollen... I changed to sand filter after the pollen fell off already so I have no comparison.
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