Not that I could tell. The jugs were submerged in the spa, which has very good circulation. Furthermore, it seems to me that the FC in the spa would have to climb to very high levels before it would slow the diffusion from jug to pool water. And that didn't happen...anonapersona said:I've got a question, did the jugs manage to keep the FC level above some point? I am thinking that diffusion relies on a difference between one fluid and the other. So that as the FC near the jug got higher, then less chlorine would leave the jug. So, the jug might be a way to insure that FC never got below some level, 2 or 3 or something, although it may be harder to make the FC get to a higher level like 8 unless flow was really high near the chlorine source.
Based on the rate of diffusion I observed over the last week, I would need approximately 10 open jugs in the pool to keep up with my chlorine demand. Not very practical...