After the water, a stream has been tended to and water is going through the channel, the channel media should be prepared to do really sifting through the particles that are in the water. In the event that those particles are not separated, you will have overcast pool water. There can be few factors that can prompt poor filtration and inevitable shady manifestations.
Is the water really going through the channel media?
Verify whether the discharge valve is enabling the water to sidestep the channel (terrible o-rings, and so on). Is the channel enabling the water to sidestep the channel media? With a sand channel, there probably won't be sufficient sand in the channel, or the sand may be diverted. On a DE channel, there may be a tear in one of the lattices or a break in the complex, or the matrices probably won't be situated appropriately. On a cartridge channel, the cartridge may have an opening in it.
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