Plaster in pool cleaner filters

[lmbbuilders]

Hows it going, Im new to this site and I'm having some issues with my pool. Its a 16x32 salt water generator gunite pool installed in June 2015 48" depth with Pentair equipment. I have a DX3 dolphin pool cleaner. I get my water tested regularly, but my Ph goes up very frequently. I have a ph meter installed and I keep it 7.3-7.8. My issue is, I just removed the bag from my dolphin cleaner and installed the cartridge kit and every week when I clean it, I have a pretty good amount of sandy material that is the same color as my plaster. My pool is a year old and im pretty sure this is not normal. As anyone heard of this problem or know what I could do? I'm not sure if this has been doing it as I use to have a bag on the cleaner. My gunite/plaster is Florida Stucco brand. Any advice or information is much appreciate, Thanks in advance.

[Denniswiseman]

You have double posted this