I got the SeaGel to try it, Drs f&s was back-ordered on the size of chemi-pure elite i needed. The SeaGel is doing what it needs to with removing nitrates and phosphate. However I do prefer Chemi-Pure elite because it does so much more than just controlling nutrients. The CPE also improves ionic exchange, stabilizes pH, raises redox, and has nearly no impact on trace elements. It also lasts a little longer.