PondScape Sludge Assault

Target Sludge Where It Lives—At the Bottom of Your Pond

PondScape SLUDGE ASSAULT delivers concentrated beneficial bacteria directly to the pond bottom where muck, sludge, and organic debris accumulate. These slow-dissolving bacteria blocks sink to the bottom and release billions of specialized microorganisms that digest fish waste, decaying leaves, uneaten food, and other organic matter that clouds water and creates foul odors.

How It Works

Each SLUDGE ASSAULT block is packed with multiple strains of beneficial bacteria specifically selected for their ability to break down organic sludge. As the blocks slowly dissolve over 2-3 weeks, they continuously release bacteria that colonize the pond bottom, consuming the muck layer and converting it into harmless carbon dioxide and water. This targeted approach reduces sludge buildup, improves water clarity, and eliminates the anaerobic conditions that cause unpleasant odors.

Available Sizes

12 Count (SKU: 52673)
Ideal for small to medium ponds up to 12,000 gallons or for monthly maintenance programs. Each block treats approximately 1,000 gallons. Perfect for water gardens and backyard ponds where regular bi-weekly treatments keep sludge under control.

24 Count (SKU: 95303)
Best value for larger ponds, seasonal treatment programs, or pond professionals managing multiple water features. Treats ponds up to 24,000 gallons or provides a full season of bi-weekly treatments for medium-sized ponds. The economical choice for serious pond maintenance.

Key Benefits

• Targeted Delivery: Blocks sink directly to the bottom where sludge accumulates
• Slow-Release Formula: Continuous bacteria release over 2-3 weeks for sustained action
• Multi-Strain Bacteria: Specialized microorganisms selected specifically for sludge digestion
• Reduces Muck Layer: Breaks down years of accumulated organic debris
• Eliminates Odors: Removes the anaerobic conditions that cause foul smells
• Improves Water Quality: Reduces ammonia, nitrites, and organic waste
• 100% Natural & Safe: Completely safe for fish, plants, pets, and wildlife
• Easy Application: Simply toss blocks into the pond—no mixing or measuring

Application Instructions

Use one block per 1,000 gallons of pond water. For best results, apply every two weeks during the active season (when water temperature is above 50°F). Simply toss the blocks into various areas of the pond, focusing on areas with visible sludge accumulation or poor circulation. Blocks will sink to the bottom and begin working immediately. For heavily silted ponds or first-time treatments, you may double the initial dose.

When to Use

Begin treatments in spring when water temperatures reach 50°F and continue bi-weekly through fall. SLUDGE ASSAULT is particularly effective after spring startup, following heavy leaf drop in autumn, in ponds with heavy fish loads, or anytime you notice sludge buildup, murky water, or unpleasant odors. For ponds with severe sludge problems, use in conjunction with mechanical removal for fastest results.

Why Sludge Matters

Sludge isn't just unsightly—it's a biological time bomb. As organic matter accumulates on the pond bottom, it creates an oxygen-depleted zone where harmful anaerobic bacteria thrive, producing toxic hydrogen sulfide gas and consuming oxygen that fish need. By actively reducing the sludge layer, SLUDGE ASSAULT helps maintain a healthier pond ecosystem with better oxygen levels, clearer water, and happier fish.

Frequently Asked Questions

Q: How quickly will I see results?
A: You'll notice reduced odors within 3-5 days. Visible reduction in sludge depth typically takes 2-4 weeks of consistent bi-weekly treatments. Heavily silted ponds may require 6-8 weeks of regular application to see dramatic improvement.

Q: Is this safe for koi, goldfish, and other pond fish?
A: Absolutely. SLUDGE ASSAULT contains only natural beneficial bacteria—the same types found in healthy pond ecosystems. It's completely safe for all fish species, aquatic plants, pets, and wildlife.

Q: Can I use this with my pond filter running?
A: Yes, and you should! Running your filtration system helps circulate oxygen throughout the pond, which beneficial bacteria need to thrive. SLUDGE ASSAULT works alongside your filter, not instead of it.

Q: How often should I apply SLUDGE ASSAULT?
A: For best results, apply every two weeks during the active season (water temps above 50°F). For maintenance of already-clean ponds, monthly applications may be sufficient. Heavily silted ponds may benefit from weekly treatments initially.

Q: Will this work in cold water?
A: Beneficial bacteria are most active in water temperatures above 50°F. Below this temperature, bacterial activity slows significantly. We recommend pausing treatments in late fall and resuming in spring when water warms.

Q: Do I still need to manually remove sludge?
A: For ponds with severe sludge buildup (several inches deep), we recommend mechanically removing the bulk of it first, then using SLUDGE ASSAULT to prevent re-accumulation and digest remaining material. For moderate sludge, the bacteria can handle it alone with consistent treatment.

Q: Can I use this with other pond treatments?
A: Yes, but timing matters. Avoid using SLUDGE ASSAULT within 3-5 days of applying algaecides, antibiotics, or other chemical treatments that may harm beneficial bacteria. It works great alongside natural enzyme products, dechlorinators, and beneficial bacteria supplements.

Q: How many blocks do I need per treatment?
A: Use one block per 1,000 gallons. For a 5,000-gallon pond, use 5 blocks every two weeks. The 12-count package provides 2-3 treatments for a 5,000-gallon pond, while the 24-count provides 4-5 treatments.

Q: What if my pond has a gravel or rock bottom?
A: SLUDGE ASSAULT works great in gravel-bottom ponds! The blocks settle into the gravel where sludge accumulates between rocks, delivering bacteria exactly where it's needed most.

Q: Will this harm my biofilter bacteria?
A: No. The bacteria in SLUDGE ASSAULT complement your biofilter bacteria. Both work together to create a healthier pond ecosystem. In fact, some bacteria from the blocks may colonize your filter media, enhancing its performance.