We are very sorry but due to another Frontier communications Outage - our phones are down. We are still shipping orders and we will reply to inquiries via email. support@123ponds.com - Thank you for your patience!

Customer Service 1.866.426.7663 Monday - Friday 10AM - 4PM EST    shipping info | privacy policy | help
Pond & Waterfall Pumps, Water Gardening Supplies and so much more!
Product Categories

Ponding 101
Did You Know?
more info >
A biological pond filter is beneficial for every pond, with or without fish. View our pond filters today!

Sludge Reducer from Tetra - Formerly AquaZyme - 40oz - 16398

Item #: 
Suggested Retail: $61.00
Our Price: Only $39.65
You save: 35%
Availability: Usually ships the same business day Estimated Delivery Date
Stock Status:
Order Quantity:

Sludge Reducer from Tetra - Formerly AquaZyme - 40oz - 16398

Product Features
Product Reviews

TetraPond - Sludge Reducer (Formerly AquaZyme™) - Improves Water Clarity - Helps clear bottom of pond.

Full season water clarifier program. Great to use in spring before water is shaded by aquatic plant cover. Contains high concentration of natural, beneficial bacteria and enzymes that consume the organic matter and nutrients, in pond water. Safe for fish and aquatic plants. Use in the spring and summer.


  • Manufacturer's Part # 16398
  • Product size: 40 oz ( 1133 g )
  • Easy Measuring
  • Treats up to 40,000 gallons
  • Degrades organic debris
  • Use as Part of Your Maintenance Program
  • Adds beneficial bacteria, that produce enzymes, to pond bottom to degrade organic debris and reduce sludge build up.
  • Helps keep water clear by reducing organic debris
  • By minimizing sludge, water clarity is improved since turbulence caused by swimming fish can agitate sludge and cloud water
  • Particularly useful in ponds with stones at the bottom where netting or vacuuming debris is impractical
  • Contains Beneficial Enzyme Producing Bacteria
  • Not harmful to fish and aquatic life when used as directed!

Product Dosage:

Regular Maintenance:

Dose every 2 weeks. 1 teaspoon (5g) treats 180 US gallons (680L). 1 tablespoon (15g) treats 540 US gallons (2040L)

Pond Start up:

Dose every week for 4 weeks. 2 teaspoons (10g) treats 180 US gallons (680L). 2 tablespoons (30g) treats 540 US gallons (2040L)

End of season shutdown:

Dose once a week for 4 weeks. 1 teaspoon (5g) for every 100 US gallons (380L).

Special Note: Works best in pH range of 6.0-8.5 with 7.0 being ideal. Provide aeration to the pond with fountain, waterfall or air pump. Keeps pumps running 24 hours a day.

How many Gallons do I have in my pond?

A: You can determine how many gallons by measuring length (L), width (W), and average depth (D) in feet (ft) or meters (m) and calculate volume using one of the following formula: Square/Rectangular: L(ft) x W(ft) x D(ft) x 7.5 = Gallons OR Circular/Elliptical: L(ft) x W(ft) x D(ft) x 5.9 = Gallons.

Exclusive Offers & Savings
Join our mailing list & SAVE!

Courteous, knowledgeable and professional sales personnel
Brand new and factory fresh merchandise
Thousands of satisfied customers
Huge stock levels - 99.8% In stock
Quality name brand products
Competitive pricing
Free Eco-Saver Shipping on orders $99+
Price Match Guarantee
128-Bit SSL Encryption

Sludge Reducer from Tetra - Formerly AquaZyme - 40oz - 16398