Fecal tranplant has potential in ALS. BUT I would be leery of going to do fecal transplant somewhere without doing a lot of homework.
Per the fecal transplant team at Duke, you will need to think about how to get eliminate 100% of your own bacteria. The clinic you are doing the transplant from will have to get you on large dose antibiotics and then monitor you, adjust dose and measure things until everything is gone. This can take a long time. You cannot transplant new things into your gut if the native microbiome still exist.
Then you have to figure out who's stool to transplant... is it from a normal person, a slow progressing als person, someone who experienced a reversal, is it treated with something like probiotics. Why did they choose this person stool to transplant, they have to be able to answer that.
Then The clinic doing the transplant will also have to have a way to Measure if the transplant is successful by testing your stool. Concurrently, they should be also monitoring your ALSFSR or some kind of scale to see if it is working.
The entire process should take about 6 month with multiple fecal transplant per week in order for it to be successful. There is no such thing as going somewhere, doing a fecal transplant once, and then be done with it. Clinics that offer fecal transplant just once without offering pre treatment or post treatment monitoring to see if the gut bacteria actually changed 3 month, 6 month, a year after transplant have the red flags of being a scam.
This is elaborated in depth in Dr. Bedlacks recent presentation to NEALS. If you are interested in fecal transplant, they are starting a trial next year using the protocol described above that I am paraphrasing.