I used clarifier (Super Blue) regularly (on a weekly basis) on both of my last two pools that had DE filters for 35 years. I did this because the pool store had me do it - it was before I ever found TFP.
However, I never had an issue with the grids. I had to replace a grid on my pool in MI once because I stupidly used a pressure washer on it and it shredded the fabric. But over 35 years, I never saw any build up on the grids, and it certainly didn't ruin any of them. They were both still going strong when I sold the homes.
Based on my personal experience of using Super Blue over 35 years, I don't see any issues - at least with a DE filter. I did add some yesterday to my pool - this morning, the haze is gone and the pool is crystal clear and sparkly. I'll pull the filter later today to look at it once this storm goes by and let you know what it looks like (pics and everything!). If it rains hard, I may wait a day to make sure I don't have to add anything before I swap the filter.