Muck Block | Kasco Macro-Zyme beneficial bacteria

It releases high‑concentration, facultative anaerobic bacteria that feed on organic muck (dead vegetation, fish waste, leaves) on the bottom of your lake or pond. They help reduce sludge, odors and nutrient buildup.

Deploy it in calm water, after you’ve cleared heavy debris if possible. Use when water temperature is ≧ ~55‑60 °F so bacteria are active.

One 6‑lb block treats up to about 6 acre‑feet of water (≈ one acre surface at 6 ft deep) and typically works for about 30 days before reapplication is recommended.

Yes. It is non‑chemical, non‑toxic, formulated to work with the ecosystem and safe for aquatic life, pets, people and plants.

Some effects (such as odor reduction) may be seen quickly (within days), but full bottom‑muck reduction is gradual. Expect visible improvement over weeks as bacteria process organics.

Yes. Although the block works independently, adding aeration/circulation enhances distribution of bacteria, increases oxygen, and improves results—especially in heavy muck zones.

Monitor the area: clear out floating debris, check bottom condition, and after ~30 days either reapply or switch to a spot treatment (pucks) if conditions are better. Also continue managing nutrient inputs (runoff, leaves).

It greatly reduces the workload but doesn’t always completely replace mechanical removal—especially with deep built‑up muck layers. It’s a biological approach that complements physical removal and chemical treatments if needed.

Yes. It’s safe for swim zones and near docks. For targeted shallow zones you might use pucks rather than the large block for localized treatment.

• Applying when water is too cold (<50‑55 °F) which reduces bacterial action.
• Placing the block in very turbid or highly silted water without first reducing debris.
• Ensure power cable and lighting cable are properly routed and secured.
• Neglecting nutrient inputs (runoff, leaf load) while relying solely on the block.
• Expecting overnight full cleanup—progress takes time.