Originally Posted by Offshore80
Mine is a Korallin. For large systems.
That explains why your nitrates are still smoking at 100+. Midwest Aquatics seeds their sulfur with freeze dried bacteria. That is why they start to reduce quicker. With the Korallin unit it could take 6 weeks for the bacteria to get going. You need to keep your drip rate very low, 1 drip per second most likely, until the effluent reads zero.
Otherwise the systems look very similar from your pictures.
Good Luck.