Re: too small to get grabbed by filter while vacuuming?
Could be any number of things. If your test numbers are good then it isn't algae. 'Good' means CC of 0.5 or none. Could be dirt carried by wind. Do you live in a rural area where farmers might be discing, tilling, spreading lime, seeding? Do you have trees or fields around that could drop pollens?
And yes, it could come from the repaired/rebuilt filter. Occam's Razor, you know? If it quacks like a duck and etc. The DE might well do it for you. Skimmer socks are great but when you have a lot of fine debris you do have to babysit them and replace them frequently. When I vacuum with a sock in the basket I normally have to stop halfway through and replace it.
Oval 12.5K gal AGP; Hayward 19" sand filter; Pentair Dyn 1 HP 2sp pump on timer
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