I've a MIG, the MMA inverter, and a DC TIG kit for it. Tig is great, love it, it's very like using a flame. Some day I'll treat myself to an AC-DC Tig...
I'd not be so sure of that. Today's inverter sticks are a lot more forgiving than a transformer machine.
I've a 90A inverter you're welcome to have a play with if you want.
...back to the diffuser. the fine bubble/ membrane variety are self-cleaning and burst through the sludge every time the blower starts.The holes are so small they're in essence closed when the blower is off. The large bubble type are a different kettle of fish.
I bought a GSE-based system from them and the pricing and buying experience were both good.
edit: I shoulf say tho do ask for a quote as the website isn't that up-to-date.
I think part of the problem will be the aeration diffuser at the bottom getting too deeply buried. Did anyone look closely at the diffuser on their plant during install? Not sure if there are many shapes or types. The bigger the holes, the slower the airflow and the more chance of blocking I'd reckon.
I'm putting 15-18kWh into the tank each day at the minute. That's covering tank losses, water for handwashing etc, and any heating demands too. ASHP has barely fired up in the past fortnight.