Bubbles in the pressure side of pumps ALWAYS mean leaks on the suction side. Finding suction leaks can be hard, but one trick can be to smear clear (so it doesn't look so messy) 100% silicone caulk on possible leaks. If the leak is small, the silicon will often fix it. Regardless, if the silicone 'sucks in' to a joint or threads . . . you have a leak.
Regarding cloudiness: if it IS bubbles (ie, dissolved air) you will ALWAYS have an accumulated bubble layer on smooth surfaces in the water. On skin, the bubbles create a very slick feel.
Ben
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