Looking to get a 'backup set' of filters and some additional misc parts for my RO/DI system.... now seems there are TONS of different brands out there. I have found the best 'deals' on ebay, I have been looking at a seller with MatriKX, not sure of the brand but if they meet the same specs (or better) as the original filters in my RO/DI system will they work just as well? or should I be looking else where? I am getting additional String wound sediment and Carbon Block filters. I have another color changing DI filter on hand but suggestion here as well are welcome.