1/4 Gallons (1.75 lbs) - BRS Bulk GFO - High Capacity - Bulk Reef SupplyWhy does BRS recommend this? Phosphates are going to be one of the biggest battles we have with a reef aquarium. The BRS GFO works even better in reactors due to it being denser than most other GFO. The price is just about double of standard GFO however you only need to use half as much which equals out in the long run. High Capacity is going to have less dust than almost all other GFO on the market and being able to buy it in bulk saves a ton of