Does this filter fit alka blue lx?

I do not have an Alka Blue machine. Mine is an Athena, which the filter fits perfectly. I don't know about the Alka Blue system, but if the label says it fits, I'm sure it does.

Will this fit and work on our older (2008) jp 108 ionizer?

Probably could as my melody machine was bought 2008 and this filter fitted perfectly. Cheers

Is there a compatible cartridge for the jupiter masterpiece ja-701, which is the 0.1m biostone?

I have used the "Jupiter Compatible Replacement Biostone Ionizer Filter" for several years now BECAUSE within the description is the word "Mavello" and I have a Jupiter Mavello Ionizer machine. I tested the water and it works perfectly. I would suggest that you look at all the filters and compare them visually with the one in your machine. Then I would also look for any of their replacement ionizer filters that have the word "masterpiece" in the title. If you cannot find that, I would take a chance on this filter and test the water with your kit when you put it in. If it still does not work, I know you can return it to Amazon.com for a refund. I have one more tip: go to www.fernnutrition.com, the company in California that sells an array of these machines, and see if the one for the Jupiter Masterpiece looks anything like the one represented here, even though this one doesn't seem to include the description "Masterpiece", which is a different model. I went through all these steps and I fretted and worried about making the right choice a long time before I purchased. P.S: Of course, if you contact Fern Nutrition, I wouldn't tell then that you are shopping on Amazon for a generic substitute, since it makes them very angry. I's just tell them that you're checking out suppliers, or somethingl. Good Luck. And thanks for asking for help. I hope I have helped you, and if you find that this Jupiter Compatible Replacement Filter works in the Jupiter Masterpiece machine, please let me know so Ican pass it onl