Finished my 4th all grain batch and have been noticing 'floaters." Mash tun is homemade and a rectangular cooler w the steel dishwasher hose as a filter and a ball valve then nipple. I do about 8 quarts of vorlauf after the mash. There arent chunks of grain and the wort is pretty clear but there are little floaters in it if you look closely that the vorlauf wont get out. I do batch sparging then repeat the vorlauf. I could have the ball valve too open. I start slow but end up with it fully open. I do Irish moss the last 15 of the boil. The particles get bigger during the boil. After the boil and chill i pour the wort through a steel strainer. There are still floaters and I think they get bigger during fermentation. I haven't noticed floaters in the final product though. Picture below which is about 24 hours into fermentation. Is this normal and I'm being a worry wort? Or should I work up a filter after the ball valve or something else?