So.. Just to update this, incase anyone is curious. I tried the above method of adding Black Chia Seeds into the fermenter of a hard seltzer (4lbs dextrose, EC118, tap water - slightly above 7ph). Man what a strange experience it has been. I added .75oz per gallon as Krasdale stated.
The chia seeds swelled up so much. There seems to be this "gelatinous" layer of chia seeds on top. CO2 does get through the layer, but I'm not sure how well. There has been blow off activity for over a week. One odd thing that I have discovered is when I "agitated" the fermenter, MASSIVE amount of activity came through the blow off. The next day, I agitated the fermenter again (purely out of curiosity and experiment) and, again, massive blow off activity. When I took a gravity reading, it had dropped from 1.035 to 1.025 and was only slightly cloudy. I did notice that the sample almost seemed slightly carbonated, and it tasted as I expect it should (sugar water with a hint of alcohol).
My thoughts:
-Is the "chia seed cap" preventing co2 from escaping as it should? Is this harmful?
-Is the resistance to release co2 through the "chia seed cap" carbonating the solution, is this hurting fermentation?
-Is the "chia seed cap" helping keep the solution "clear" and keeping it from getting super cloudy as I would have expected with plain tap water?
I would love to know everyone's thoughts on this and I hope it can help others!