For the last couple of seasons, I've put a small PVA mesh bag of powder on my hook before every cast. (Currently a mixture of CreAmino Bag and Stick Mix as I'm using the boilies and Sonubaits Krill Groundbait and also their Explosive Fishmeal Groundbait Mix.) Most of my fishing is done by dropping from a bait boat or on my local water, fishing in the margins. I make up about 30 bags at home and store them in an old ice cream tub to speed things up on the bank and to stop wet hands making holes in it.
I was watching a video on YouTube the other day and there was a bag that was absolutely fizzing. To replicate it, I added a bit of baking powder to my mix and dropped a bag of with and without in a tub of water to see the difference. The baking powder bag definitely gave off a stream of bubbles but the most interesting part was just how long it took for the bags to breakdown, both at least 5 minutes. I made the bags up fresh so there was no oil rendering the PVA impervious to the water. A piece of the mesh only shrivelled up within seconds.
I've always side hooked the bags and was confident I would be fishing within 30 seconds, not I'm not so sure. I always laughed at people who double bagged "because they were fishing in 10 foot of water", they could be delaying their next bite by half an hour!
I prided myself that I could tie the 2 knots so close together, I could only just get the scissors through .(I know, tight!) Since watching the bags, I've include a "fuse" of about an inch and hook this on as I'm convinced it will be fishing properly within seconds. (Long enough to hit the bottom.)
In the photo, the Baking Powder bag is on the right which is why it is a bit lighter.