OK. So, you've got iron?

Post full pool and test info (gallons, pool surface, filter type + test results)

And, if possible, find out WHERE the iron is coming from. One way to check is -- if your toilet fills with the same water as the pool -- is to check the toilet tank. If the interior is dark orangish-brown . . . you have iron in the fill water. (But, if you have a softener or iron removal filter on the house this won't work.)

Meanwhile, run the filter 24/7, but make sure the return eyeballs are directed so that water flow is NOT directed against a pool surface.