Shop / GloFish & Tetra / Tetra Algae Control Pond Anti-Algae Block Water Treatment Tetra Tetra Algae Control Pond Anti-Algae Block Water Treatment $7.99 4 Blocks (1 block treats up to 250 gal) 6 Blocks (1 block treats up to 80 gal) 4 Blocks (1 block treats up to 250 gal) 6 Blocks (1 block treats up to 80 gal) Purchase Options Free In-Store Pick Up Not Available Set your store for inventory and store pickup details Zip Code Search Same-day Delivery* Not Available No minimum charge for delivery orders. *Order before 2pm and have it delivered today. Orders placed after 2pm will be delivered the next day. Must be inside delivery radius. Zip Code Unfortunately delivery is not available to this address. In order to ensure the best availability accuracy, changing your selected store will remove all items from your cart. You will need to re-add these items with your newly selected store if you choose to continue. Continue Cancel Ship it to Me Not Available Quantity Add To Cart Information Ingredients Clear cloudy ponds and remove algae with Tetra Algae Control Pond Block Water Treatment. Cloudy water is caused by overfeeding, gravel sediment, soil and other particles and algae is common in ponds and fountains. Both can result in poor water quality and cause stress to fish. Tetra Algae Control Pond Block Water Treatment works to clear water and algae in backyard containerized ornamental ponds and fountains. It EPA approved and not recommended for use with live plants.Why We Love It: For containerized ponds only Limited to use for backyard or homeowner ponds and water fountains Not for use with live plants About TetraTetra aquarium products are dedicated to helping seasoned hobbyists and beginners alike to enjoy a successful, life-long aquatic experience. Our complete line of Tetra nutrition, water care, filtration and aquarium products help make fishkeeping accessible to all hobbyists so they can benefit from its rewards. N/A Customers also liked Customer Reviews