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Is there a "normal" pressure for a sand filter? I've been SLAMing for a week, with no improvement to green water. Visibility is approx 3.5 feet. After backwashing, my pressure is 10-12 psi and flow out the returns seems good. If I take in water only from one skimmer and a vacuum port located...

Read the post of revised chemical levels for different kinds of pools. Wondered what your thoughts are on Clayton-Lambert stainless steel/concrete bottom (painted) pools.

When testing results in passing the OCCT and CC tests, but the water is still cloudy, what does the continued addition of large amounts of chlorine do to clear the water? How long to go before looking for a different (non algae) cause of the cloudiness? Could extended and overuse of DE in a...

Been slamming for over 2 weeks, with little improvement in cloudiness. There are lots of bubbles in the pump basket, sand filter and out the return lines. Pressure stays steady for days, even after backwashing (milky wastewater). Two high skimmers, 1 vacuum suction line 3 ft below surface, no...

Have just finished 2 weeks of SLAM. CC 0.5 (it was never above 1.5), and passes OCLT. Water still cloudy, perhaps 5 ft vert vis. PH isn't accurate while SLAMing; how about Alkalinity? Reads 200 now. Circulation has always been a prob. New Hayward Super Pump and motor (1HP, I think) in 2011...

So, aeration will increase PH?

Over past month, pool has gone from emerald green, to lime green, to mostly clear (after adding Super Floc), to cloudy blue. Have used about 54 lbs of calhypo, and at least 50 gal of 10% liquid. What settles to the bottom is a very fine white silt. Is that algae that has been bleached white...

What does it mean when both free and total chlorine levels are zero? This, after adding 54# of cal-hypo and 16 gal of LC over past month. Water is still cloudy, backwash is cloudy but not green. I've heard that too much chlorine can "overwhelm" test kits and result in bad readings.