UltraClear Sludge Digester – 32 oz | Natural Pond Sludge & Muck Remover

UltraClear Sludge Digester – 32 oz (SKU 47125) is a professional-grade liquid pond sludge and muck remover, formulated with a proprietary blend of beneficial bacteria and enzymes that digest organic pond bottom waste — fish waste, dead algae, fallen leaves, decaying vegetation, and accumulated organic sediment. Works at water temperatures down to 40°F and scales for ponds of all sizes at the standard maintenance dose of 1 oz per 1,000 gallons. Trusted by pond professionals since 1993. Unlike pellets or tablets that only treat the pond bottom, UltraClear Sludge Digester is a liquid formula that disperses throughout the full water column, reaching every part of the pond. The liquid format also allows targeted application — dilute your dose in a gallon of pond water and concentrate it in areas of known sludge accumulation for maximum effect. SKU 47125 32 oz 1 oz per 1,000 gal Bacteria + Enzymes Works from 40°F Made in USA 30+ Years Trusted ⚠ Important: Do NOT exceed once per week during peak summer. Overdosing in warm water can deplete dissolved oxygen and release nitrogen and phosphorus, potentially triggering algae blooms and stressing fish. The maintenance dose (1 oz / 1,000 gal) is specifically calibrated to digest sludge safely. For heavy sludge, increase frequency to weekly — never daily — in summer. Fall dosing at daily rates is safe because cold water holds more oxygen. See dosing section for seasonal guidance. ✅ Organic sludge only: UltraClear Sludge Digester digests organic material — fish waste, leaves, dead algae, decaying vegetation, and organic sediment. It does NOT dissolve inorganic material such as sand, silt, or clay. Ponds with significant mineral sediment (clay-bottomed ponds, ponds near construction) will need mechanical removal for the inorganic fraction. Dosing Quick Reference Maintenance (Year-Round) 1 oz per 1,000 gal Once/month minimum — once/week maximum Do NOT exceed once/week in summer Fall Clean-Up (When Temps Drop) 1 oz per 1,000 gal Daily for 4–7 consecutive days Cold water safely handles intensive dose Best results: Dilute your dose into 1 gallon of pond water, mix briefly, then distribute around the pond. Concentrate near known sludge accumulation areas or locations with odor problems. Key Features & Benefits 🧫 Proprietary Bacteria + Enzyme Blend UltraClear Sludge Digester contains a proprietary blend of beneficial bacteria and enzymes — not just bacteria. The bacteria include facultative strains that work in both aerobic (oxygenated) and anaerobic (low-oxygen) zones, meaning they actively digest sludge right at the pond bottom where oxygen is depleted. The enzyme component accelerates the breakdown of the complex organic molecules found in sludge. 💧 Liquid Formula — Full-Column Coverage Unlike tablets and pellets that sit at the pond bottom, UltraClear's liquid formula disperses throughout the entire water column when poured in. This means every zone of your pond receives treatment. For targeted application at known problem spots — under overhanging trees, corners where leaves accumulate, areas with visible odors — dilute the dose in a bucket of pond water and pour it directly over those areas for concentrated delivery. 🌡️ Effective from 40°F UltraClear Sludge Digester begins working at pond temperatures as low as 40°F — earlier in spring than many standard bacterial treatments. Bacterial activity slows in cold water but the product remains active, allowing spring sludge treatment to begin as soon as ice-out. For peak performance, product works best at temperatures above 50°F when bacteria reproduce most rapidly. 📅 Two-Protocol Seasonal Program UltraClear Sludge Digester has two distinct seasonal applications: (1) Summer maintenance (1 oz/1,000 gal, once/month to once/week) — steady digestion of ongoing waste without oxygen depletion risk; (2) Fall clean-up (1 oz/1,000 gal daily for 4–7 days) — intensive end-of-season sludge removal before winter, when cooler water safely handles the higher bacterial activity and oxygen isn't at risk. The fall clean-up resets the pond for a clean spring start. 🤝 Pairs with UltraClear Pond Clarifier For a complete pond health program, combine UltraClear Sludge Digester with the UltraClear Biological Pond Clarifier. Sludge Digester targets the heavy organic accumulation at the pond bottom; the Clarifier targets suspended particles in the water column that cause cloudiness. Together, the two products address pond water quality from top to bottom — many pond owners use both simultaneously as a complete system. 🛡️ Safe & Chemical-Free UltraClear Sludge Digester contains no harsh chemicals — only naturally occurring beneficial bacteria and enzymes. Safe for koi, all pond fish, aquatic plants, pets, birds, and pond wildlife when used at labeled doses. American-owned and manufactured since 1993, with 30+ years of proven pond care results. Compatible with UltraClear's full product line and most pond treatments. Technical Specifications Specification Value SKU / MPN 47125 Size 32 oz Active Components Beneficial bacteria + enzymes (proprietary blend) Bacteria Types Heterotrophic, facultative (aerobic + anaerobic capable) Maintenance Dose 1 oz per 1,000 gallons — once/month to once/week Maximum Summer Frequency Once per week — do NOT exceed in warm water Fall Clean-Up Dose 1 oz per 1,000 gal daily for 4–7 consecutive days Min. Water Temperature 40°F (effective; best performance above 50°F) What It Digests Organic material only: fish waste, leaves, dead algae, decaying vegetation What It Does NOT Digest Inorganic material: sand, silt, clay, mineral sediment Safety Safe for fish, plants, pets, birds, and wildlife at labeled doses Made In USA (since 1993) UltraClear Sludge Digester Size Family Size SKU/MPN Best For 12 oz 47120 Small ponds; trial; occasional use 32 oz ← This 47125 Medium ponds; seasonal maintenance; best value for most 1 Gallon 47130 Large ponds; frequent treatment; bulk value Frequently Asked Questions How does UltraClear Sludge Digester remove pond muck without vacuuming? UltraClear Sludge Digester contains a proprietary blend of beneficial bacteria and enzymes specifically selected to digest organic sludge. These include facultative bacteria — strains capable of working in both aerobic (oxygenated surface water) and anaerobic (oxygen-depleted bottom) zones, allowing them to actively digest sludge right at the pond bottom where oxygen levels are lowest. The bacteria and enzymes break down the building blocks of organic sludge: proteins, starches, fats, and cellulose — the substances found in fish waste, dead algae, fallen leaves, and decaying vegetation. The byproducts include water, carbon dioxide, and other decomposition compounds that are naturally cycled through the pond ecosystem. Important note: The product digests organic sludge only. Inorganic material such as sand, silt, or clay cannot be digested by bacteria and requires mechanical removal. Is UltraClear Sludge Digester safe for Koi, goldfish, and frogs? Yes — UltraClear Sludge Digester is a 100% natural, chemical-free biological treatment safe for all pond fish (including sensitive koi and goldfish), aquatic plants, amphibians, birds, pets, and other pond wildlife when used at labeled doses. The important caveat is overdosing in summer: Exceeding the once-per-week maximum during warm-water months can deplete dissolved oxygen as bacteria rapidly digest sludge, and can release excess nitrogen and phosphorus. These are not hazards of the product itself but of applying too much too fast when oxygen levels are already lower in warm water. Follow the dosing guidelines and your pond inhabitants will not be harmed. How much area will a 32 oz bottle treat and how long will it last? The standard dose is 1 oz per 1,000 gallons per application. A 32 oz bottle provides 32 doses. How long it lasts depends on your dosing frequency: Monthly maintenance (1,000-gal pond): 32 months (~2.5 years) Biweekly (1,000-gal pond): 16 months Weekly maximum (1,000-gal pond): 32 weeks (~8 months of peak season) Fall clean-up daily dose (1,000-gal pond): 32 days of daily treatment For larger ponds, scale proportionally: a 5,000-gal pond at weekly dosing uses 5 oz/week, so a 32 oz bottle lasts ~6 weeks of weekly treatment. Will this product help eliminate bad pond odors and sulfur smells? Yes. Bad pond odors are caused by anaerobic decomposition — organic waste rotting in the oxygen-depleted zone at the pond bottom, producing hydrogen sulfide (the "rotten egg" smell) and other odorous gases. UltraClear Sludge Digester targets the organic matter that sustains these anaerobic zones, breaking it down and gradually reducing the anaerobic dead zone at the pond bottom. As the organic layer shrinks, hydrogen sulfide production drops and odors improve. Consistent use through the season prevents odor from returning. Can I use Sludge Digester alongside the UltraClear Pond Clarifier? Yes — using both simultaneously is highly recommended for complete pond water quality management. Each product addresses a different problem: Sludge Digester: Targets heavy organic accumulation at the pond bottom — the muck layer, fish waste, decaying leaves, and dead algae. Pond Clarifier: Targets suspended organic particles in the water column that cause cloudiness, green water, and turbidity. Together, they address water quality from top (suspended particles) to bottom (accumulated sludge). Use each at its labeled dose — there's no need to reduce dosing when using both products together. How often should I apply the treatment for the best results? Two distinct dosing programs based on season: During the active pond season (spring through early fall, water above 40°F): Dose 1 oz per 1,000 gallons, at least once per month for maintenance and up to once per week for problem ponds or heavy sludge accumulation. Do NOT dose more than once per week during peak summer — warm water holds less oxygen, and overdosing can deplete oxygen levels and release nutrients. Fall clean-up (when temperatures and sunlight begin to drop): Dose 1 oz per 1,000 gallons daily for 4–7 consecutive days. Cooler fall water safely handles this intensive treatment without oxygen depletion risk, and the more aggressive dosing removes the accumulated summer's organic load before winter. Why Buy from Pond Pro Direct? Authentic UltraClear products — trusted American-made pond treatments since 1993 Expert pond water quality guidance — call or text (765) 508-4352, Mon–Fri 9am–5pm EST Free shipping on all orders Price match guarantee on identical products 30-day return period on eligible items