Priming, cleaning, and lint

russrimm said:

First - I clean my filters every 3-4 months. Every time I have this big pile of lint. We do tend to wear a beyond abnormally excessive amount of clothes in the pool. Any harm?

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I am surprised the lint is not being caught by your skimmer or pump basket before it reaches your filter. It may be wise to turn off the power to your pump and check your impeller that it the strands are not wrapped around it or accumulate over time.

russrimm said:

Second - what’s the easiest way to prime my pentair intelliflo after cleaning - I’ve battled this challenge for decades.

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You could fill your bottom half of filter with water before putting the lid on as well as fill the pump basket with water.
Is your pump significantly higher than your pool water level?

russrimm said:

Third - Pentair 4 cartridge filter - after reinstalling the lid I sometimes have a drip. How to prevent these? I usually tap gently around the ring while tightening every few turns. How do I know what’s right enough?

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I always tighten until the spring is just fully compressed. I don't go pass that. I also tap as you do while tighten the band.