I got that email this morning and had a look. I like the look of it, and like that it's made in Wales, I'm just not sure about the price. I don't do much film developing at present so twirling the stick and inverting seem good enough at present for me.
There was a reason why Paterson redesigned their dev tank, so using an old style one for the video doesn't really help. And why would you have the twilrling stick inside the tank while you are inverting it? The amount of black debris in the open tank sequence at the end would also horrify anyone processng their own film, so they should really have made more effort to exclude that.
I'm assuming this is based on the magnetic stirrers we used to use in labs many years ago for dissolving chemicals, but that would mean something sitting below the reel and therefore requiring more chemicals? That would be OK for 35mm, but I don't think there's much headroom in the tank with a 120 reel. I can't see them having a big market for this, but fair play to them for trying.
Aldi and Lidl occasionally sell an ultrasonic cleaner for around £15-20. I bought one a few years ago for cleaning carburettor parts and never ended up using it. Might be worth digging it out and seeing if I can fit a developing tank in it, worth trying for the sake of curiosity if nothing else.
There was a reason why Paterson redesigned their dev tank, so using an old style one for the video doesn't really help. And why would you have the twilrling stick inside the tank while you are inverting it?
I occasionally use an older Paterson System 4 tank, as it allows me to put two 35mm reels in at once. It leaks like a sieve when inverted, that's why I use the twiddle stick to agitate. I much prefer my later Super System 4 tank with the Tupperware style lid, which doesn't leak at all when inverted.
@Peter B is quite right when he argues that this daft device is a solution to a problem which hasn't existed for many years. If you just have an older Paterson tank, bin it and buy a new type - it's a lot cheaper.
My first thought was ultrasonic. Back in the 70s I worked in the textile industry and one task I was given was testing ultrasonic tanks to clean the stainless-steel sprung reels used for pressure-dying crimplene yarn (yes, I had some classy suits). It was very effective but at the time difficult to scale up.
Why do you want to use such a thing? I proved to my own satisfaction 50 years ago that continuous agitation tends towards increased grain. Nitrogen bubble agitation such as we used in the old 25 gallon tanks didn't because it was much more gentle than any mechanical process (when adjusted to the correct pressure).
I cant say my tanks leaked much, never had any problems with a gentle inversion a few times a minute. I wouldn't be buying one. Anyway I suspect you could make your own with... Errr well a you know what for a lot less.
I've just been reading the threads on Photorio and FADU, so I can save you the time by telling you that there were a variety of posts similar to this thread suggesting why this might not actually work in practice. Possibly more interesting is that the producer quotes his price as £25.99, which looks like a pretty big mark-up for Jack the Hat
I dev lots of sheet film.
Agitation is done by hand which offers considerably more control over how gentle or aggresive the movements are performed.
As for roll film; again aitation performed by hand either through inversion or using the "twidly stick" that comes with patterson daylight tanks is, imo, a much better method of controlling grain / contrast……...I don't believe that your device will understand if i request it to "slow down" so as not to ruin my film…..My hands on the other hand
I stick by my opinion that this motorised apparatus is nothing but a gimmick and a load of tat!