[Growers] Q&A

Hey all! So I have a new issue that I am hoping for some perspective on. For context, I fertigate through a pc emitter drip system into coco in my greenhouse. I've been doing this for years without issues. However, more recently I have started having some clogging. Yay. I flushed the system and found what appears to be small silica or quartz in a white substance? I had a deposit in one of my 200 mesh filters and took a pic. Can anyone confirm that the tiny reflective element in the pic is likely silica? If not, any idea what else it might be? There is nothing reflective that I see in any of our ferts. We do inject potassium silicate along with pot carb/hydrox for our pH adjust. It's never been an issue, but I did recently repair the injector/sensor. It is injecting more than it has in the past, but not that much more. My next though is to take the sample that clogged the emitter, mix with some RO and send off for water analysis to confirm. However, Clemson doesn't test for silica I believe...so will need to find a lab that will or maybe a lab that will test the dry material? In the meantime, I have reduced the amount of pot silicate to see if it helps. All thoughts are appreciated!

Update: It appears to be calcium phosphate...a result of higher amounts of MPK and Cal Nitrate in one of my early flower recipes. I have resolved the clogging by lowering my early flower EC and reducing the calcium inputs. Thank you for the assist!

Side note: I recently purchased one of the mid infrared Neospectra units for analysis. It does nutrient analysis in leaves...not just cannabinoids. This thing is a game changer! I tested leaves and made changes to my recipes in under an hour. They also have incredible support.