You don't mention a specific product, so anything we could say on the matter is speculation. But even if one were to assume some level of efficacy, I wouldn't assume that two weeks will be enough to make a real difference. Considering how quickly the microbiome is known to return to baseline, I wouldn't assume greater efficacy than an FMT. If the FMT involves flushing out the system first (for the sake of rectal entry), the flush itself will impact the microbiome composition (often in the favor of opportunistic bacteria), potentially undoing what a biofilm buster may have accomplished.