I purchased some Hydrosource soil additive to try in dewatering both WVO and Biodiesel.

I made a nice emulsion of biodiesel and water.

I started out with about 300mls of biodiesel milkshake.

I made a "tower" out of a old 1 gal water bottle. I cut the bottom out and I drilled a small hole in the cap and put in some coffee filters in it to keep the grains of hydrosource from going anywhere.

To the tower I added 1lb of hydrosource which is most likely more than needed.

I added the biodiesel milkshake which was at room temperature 85F or so.

I had to pass the biodiesel thru the hydrosource about 8 times to be able to see thru the biodiesel. I lost about 60mls of volume and ended up with about 240mls of what appears to be dry biodiesel.

As soon as I get a working camera I will try and post some pictures.

Sounds positive. Shows it does work.

If you can try a tall thin pipe instead of the bottle it might help all the bio come into the contact with all the grains and provide efficient reliable results.

Combine this with a slow flow rate from the bottom and out the top fed by gravity from a container above the top of the pipe. The idea is that the grains that swell the most first will be at the bottom and not have the weight pressing down on the not so used grains below. It also allows you to control the time the bio is in contact with the grains (residency time) which is harder to do if you just let it run down under gravity.

You can use a flexy pipe with a clamp like they do in fish tanks to control the flow. You will need to use enough bio to fill the column as well as come out the top. You will lose some of the first batch to fill the column.

If it is too hard to do upflow then the downflow is still well worth carrying on with.

I have been keeping it simple and just adding the crystals to the washed bio with some stirring and letting it sit a couple of days or more (up to a week now)...the crystals seem to be picking up some water that way and so far I don't think they are being degraded by long term contact with the ester (but I could be wrong).