The one on the left spent 1 week in primary, on the right is another batch that has spent a week in secondary after 1 week in primary. Same beer, same recipe, very different clarity levels! The only difference from one to the other was the use of a grain bag during the mash when brewing the one on the left. OG for both batches came in pretty well spot on.
The bag certainly does make a difference in clarity!
I'm still rather new to this, so bear with me! The batch is all grain and the bag was used for the entire mash time. My tun is simply a steel pot. The boil and cool down times were kept as similar as possible from batch to batch.
I just realized what can't be seen in the photo. I had a light shining down into the one on the left to highlight the clarity difference. Also, these are only 1 gallon jugs as I am a 1 gallon brewer! :)