The problem with oil dry is breakdown. And it is SUPER dirty. I ran my 75 g with it for a while and uncapped, couldn't handle it at all. Then capped, it ends up getting messy.
You could soak it in a bucket with a dilute fert mixture, and even more importantly some calcium carbonate so it doesn't strip KH completely.
In my tank(tap ph almost 9, TDS 450) it would strip the kh down into the 5-10 from near 30 or higher.
I wouldn't use it or recommend it anymore. Cheap option close to it is the Turface line of products. Better color, too.
I tried it in a few "test" tanks and by the end of a year it was mush. Completely worthless and makes the oil dry not useful for us, in my eyes.