Always go a step up when buying filters. Great filter. I have always purchased this brand. They last for year's. No need to anything when the power goes out, it starts itself.
I have used this model for years. The filter has been good but replacement cartridges are disgusting, nasty, filty,! Suggest you open boxes and check filters! Charcoal all over the place....with Tetra terrible customer service,, I'll drop them!!!! Tried giving them lot numbers they don't care!!