Well.. I did find this in the amazon reviews for this pump where some ppl are complaining about the sand issue -
"Sand in pool check your laterals for tighteness!
By
Amazon Customer on August 4, 2020First off Intex I'm ******! I GET THIS NEW FANCY PUMP! What happens......it starts putting sand in my pool. Every day I'm getting in the pool and putting my goggles on and tediously vacuuming the entire pool. The sand is all over the place. So I start researching and people talk about broken laterals and bad seals etc etc etc. So I check all seals before taking out my bran new sand. Doesn't fix it. I read that my Aqua Quartz sand is to fine for Intex even though it's #20 Silica sand. So next I remove sand, inspect lateral and it looks perfect, This time I try a less expensive QUICKRETE pool sand that does indeed look larger in grain. Next morning still sand all over the pool. I have backwashed all the sand to heck and back so don't worry there. You can bathe in my sand it's that clean! So I go by Leslie Pool Supply because I hear that 20/40 sand like Quickrete will also cause you issues. I mean come on Intex how finicky can your pump be? I inspect Leslie's Puruvian dream spectacular tubular brand sand and what do you know it looks like Quickrete has a deal with Leslie's Pool Supply to package the same sand in Leslie pool Supply logo and it's sold for 7 dollars more. Now I keep hearing lateral....lateral in my head so this time I inspect that lateral with a microscope...in fact I took the dam thing apart. Oh Intex you great destroyer of all things fun guess what I found??? ****
I found that your weak handed assembler of your pump did not tighten each plastic end of the lateral all the way... Being that the sand is pretty fine I could see in each area where you screw the little plastic piece into the lateral that has the little filter grate to keep sand out. The sand was getting through each lateral insert. ***So in short had your employee done their job I would have had a minimum of 10-20 hours of my time spent floating in my pool instead of cleaning and trouble shooting. Quality control people and fire any mployee without the proper hand strength to do the job right. Again the issue was the little plastic deals at the end of the lateral...there are like 8 or so of them.
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So, since I have two of the sand barrels now - I may shop vac the one not in use (get all the sand out) and check the laterals on that barrel..