API Pond Pond-Zyme Plus – 1 lb (Sludge Remover & Natural Clarifier)
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Description
API POND-ZYME SLUDGE DESTROYER – 1 lb (SKU 4146, MPN 146B) is a concentrated dry-powder pond cleaner combining specially selected bacterial strains and natural barley that work through enzymatic action to break down fish waste, dead algae, leaves, and accumulated pond sludge. A single 1 lb container treats up to 16,000 gallons of pond water. Sprinkle directly around the pond perimeter — no pre-mixing, no measuring liquids.
Through both enzymatic breakdown and natural barley's algae-inhibiting properties, POND-ZYME reduces pond maintenance by accelerating decomposition of the organic matter that clogs filters, depletes oxygen, and causes cloudy, smelly water. Used twice a week for two weeks at spring startup, then every two weeks for ongoing maintenance — one jar provides approximately a full active season of treatment for most backyard ponds.
Official Dosing Schedule
Use enclosed measuring scoop
Use enclosed measuring scoop
One enclosed scoop = approximately 2 teaspoons. Sprinkle evenly around the pond perimeter with pump running. For best results, use alongside API POND ACCU-CLEAR for enhanced water clarity.
Key Features & Benefits
Technical Specifications
| Specification | Value |
|---|---|
| SKU | 4146 |
| API MPN | 146B |
| Official Name | API POND-ZYME SLUDGE DESTROYER |
| Size | 1 lb (454g) |
| Coverage | 16,000 US gallons |
| Active Ingredients | 5 bacterial strains + natural barley (enzymatic action) |
| Form | Dry powder (with enclosed measuring scoop) |
| Spring Start-Up Dose | 4 teaspoons (2 scoops) per 200 gal — 2× per week for 2 weeks |
| Maintenance Dose | 2 teaspoons (1 scoop) per 200 gal — every 2 weeks |
| Application | Sprinkle around pond perimeter with pump running |
| Pump During Treatment | Leave ON — circulation distributes product |
| Safety | 100% natural; safe for fish, plants, wildlife, pets |
API POND-ZYME SLUDGE DESTROYER Size Family
| Size | Coverage | SKU | Best For |
|---|---|---|---|
| 8 oz | 8,000 gallons | — | Small ponds; trial; seasonal top-up |
| 1 lb ← This | 16,000 gallons | 4146 | Medium-large ponds; full season treatment; best value |
Frequently Asked Questions
What is the difference between API POND-ZYME and other sludge removers like API EcoFix?
POND-ZYME and EcoFix are complementary API pond treatments with different active ingredients:
- API POND-ZYME SLUDGE DESTROYER (this product): Dry powder containing bacteria and natural barley, working through enzymatic action. Barley contributes additional biological properties. Dry powder format. Treats up to 16,000 gal (1 lb).
- API POND ECOFIX SLUDGE DESTROYER: Liquid concentrated beneficial bacteria only — no barley, no enzymes. Works through bacterial digestion. Liquid format for easy pouring.
Both target organic sludge and pond waste, but POND-ZYME's barley addition and enzymatic mechanism give it a somewhat different mode of action. Some pond keepers use both products in rotation or combination for comprehensive organic management.
How much water does the 1 lb container treat?
The 1 lb container treats up to 16,000 US gallons — double the coverage of the 8 oz size (8,000 gal). For dosing calculation, API POND-ZYME uses: 2 teaspoons (1 enclosed scoop) per 200 gallons per maintenance dose. If you don't know your pond volume, use: length (ft) × width (ft) × depth (ft) × 7.5 = gallons.
Note: "treats up to 16,000 gallons" means the entire container contains enough product for that volume at the maintenance rate. For a 1,000-gallon pond at biweekly maintenance dosing (10 tsp/dose), the jar provides approximately 8 months of treatment.
Is API POND-ZYME safe for koi, goldfish, and live plants?
Yes — POND-ZYME is 100% natural and completely safe for koi, goldfish, turtles, all pond fish, water lilies, aquatic plants, frogs, and other pond wildlife. It is also safe for dogs, cats, and birds that drink from or use the pond. Because it contains only natural bacteria and barley with no synthetic chemicals, it doesn't alter pond chemistry in a way that stresses aquatic life when used at labeled doses.
Can I use POND-ZYME in cold water during spring start-up?
Yes — POND-ZYME can be applied at spring startup and includes a specific intensive spring dosing protocol (4 tsp per 200 gal twice weekly for 2 weeks). Bacterial activity is highest above 50°F when bacteria reproduce most rapidly, but the enzymatic action of the barley component remains active at cooler water temperatures, allowing POND-ZYME to begin working even in cool spring water. Start the spring startup protocol as soon as your pond is thawed and fish become active.
Does POND-ZYME help prevent filter clogging and reduce maintenance?
Yes — this is one of POND-ZYME's primary benefits. By digesting suspended organic matter and sludge before it reaches your filter pads, skimmer nets, and pump screens, regular POND-ZYME use reduces the frequency of filter maintenance. Organic material that would otherwise compress into filter pad biofilm and restrict flow is broken down in the water column and at the pond bottom before it can clog the mechanical filtration. Most pond keepers who use POND-ZYME consistently report noticeable reductions in filter cleaning frequency over a full season.
Why Buy from Pond Pro Direct?
- Authentic API products — genuine fresh-dated inventory
- 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
Price Match
At Pond Pro Direct, we want you to shop with confidence, knowing you’re always getting a good deal.
We will match or beat the lowest online price on its products.
If you find a lower price for any products on our store, we will beat it by $50 for products listed over $2000. In order to be eligible, you must provide proof, whether a screenshot, invoice, email, etc. of the lower offer.
Please note that this does not apply to every product in the store, so reach out via email or chat for confirmation before purchasing.
For the policy to apply, simply send us a screenshot, link, or any other proof of the lower price.
For more information, please check out Price Match Policy Page
Shipping & Delivery
Order Processing
Orders are processed within 1–5 business days, depending on product type, brand, and fulfillment method. Products sold on Pond Pro Direct ship directly from manufacturers or authorized distribution partners and do not ship from a single centralized warehouse.
Processing times may vary by brand, item type, fulfillment method, and whether an item is made to order or ships via freight.
Order Confirmation
After placing your order, you will receive an order confirmation email confirming that we have received your order and pre-authorized your payment method.
Once your order is received, we contact the manufacturer or distribution partner to confirm availability and fulfillment timelines.
- If an item is unavailable or on backorder, we will notify you by email and void the pre-authorization.
- If the item is available, the payment will be processed and the order submitted for shipment.
Order Shipment
If your order is in stock and payment is processed, it will typically ship within 6–13 business days. Once your order ships, tracking information (when available) will be sent to the email address provided at checkout.
If you do not receive shipping confirmation within 6 business days, please contact us at support@pondprodirect.com.
Shipping Destinations
At this time, we primarily ship within the United States. Some products may be available for shipment to Canada. If the website allows checkout and accepts your shipping address, the product is eligible for delivery to that location.
Changing Your Shipping Address
Address changes after an order has been processed or shipped may result in delays or additional carrier fees. Any carrier charges associated with address changes are the responsibility of the customer.
Shipping Times
All shipping times are estimates only and not guarantees.
- Typical handling time: 1–5 business days
- Typical transit time after shipment: 5–8 business days
- Estimated delivery window: 6–13 business days
Delivery timelines may vary based on brand, item type, production status, freight requirements, and carrier availability.
If an order is cancelled after it has been processed or shipped, the customer may be responsible for applicable shipping charges, freight fees, carrier return fees, and warehouse handling costs, where applicable.
Shipping Options
Available shipping options vary by product and location.
Our standard Curbside Delivery option is provided at no additional cost where applicable and delivers the item to the curbside or driveway of the delivery address.
Additional options, such as Threshold Delivery or White Glove Delivery, may be available for select products and locations.
For full details regarding freight delivery, inspection requirements, liftgate service, returns, and customer responsibilities, please review our full Shipping Policy page.
Returns & Refunds
Cancellations & Refunds
Orders may be canceled free of charge before shipment, unless the item is classified as Custom or Made-to-Order (see below).
If you have questions about your order, please contact us at support@pondprodirect.com or call (765) 508-4352 during business hours.
Cancellations (Before Order Ships)
If you need to cancel an order before it ships, please contact us as soon as possible. Orders canceled prior to shipment are eligible for a full refund.
You can reach our team by phone at (765) 508-4352, via live chat on our website, or by email at support@pondprodirect.com.
Cancellations (After Order Ships)
Once an order has shipped or entered fulfillment, it may no longer be eligible for cancellation. If you no longer wish to keep the item, you must wait until delivery and then request a return.
A Return Merchandise Authorization (RMA) is required before returning any item.
Custom or Made-to-Order Items
Custom or made-to-order products are produced specifically for your order and cannot be canceled or refunded once production has begun, except in cases of defect or error.
Product pages will clearly indicate when an item is custom or made-to-order. If you are unsure whether an item falls into this category, please contact us before placing your order.
Returns & Refunds
Returns are subject to the following conditions:
- Customers have 30 days from delivery to request a return, unless otherwise stated on the product page or by manufacturer policy
- Items must be unused, uninstalled, and in original packaging
- An RMA is required prior to returning any item
Because we ship products directly from manufacturers, return eligibility may vary by brand. If a manufacturer does not permit returns on a specific product, we may be unable to accept the return. Please contact us if you would like confirmation of return eligibility for a specific item.
Fees & Shipping Costs
- Return shipping costs are the responsibility of the customer unless the item is defective or shipped in error
- Freight / LTL shipments may incur higher return shipping costs due to carrier fees
- Approved returns of non-defective items may be subject to a restocking fee of up to 25%
- Original outbound shipping charges are non-refundable
If you are exchanging an item rather than returning it outright, we may be able to assist with some costs depending on the product and manufacturer.
For full details, including freight deliveries, damage reporting requirements, and manufacturer-specific terms, please review our complete Return and Refund Policy
