The Clarisea's have been perfect for me. My rolls last about 6 weeks and are super easy to replace. My Synergy sump was built to accept two of them, but I think they are made to adapt to most sumps. You can hang them as well. Good luck.Sorry if I hijacked your post. I’m new and was over zealous to chime in. I am running the AF-RS170 but can never get replacement filters. It also takes a filter roller that’s 3.2 as opposed to 4 inches wide for the ClariSea. Seems like a lot more surface area to remove debris. I also only need 450 GPH on the return. I wonder if the Clarissa would fit in a RedSea reefer 170 sump. Does the Clarissa work well for you? Is it easy to change the rollers?