Marine Depot now offers FREE economy shipping with no minimum purchase for 99% of the products we carry! Orders under $199 are shipped FREE using a mix of economy shipping methods including USPS First Class Mail, SurePost and UPS Ground. These shipments are typically delivered in 5-7 business days. Orders placed Monday-Friday before 10:30 am PST are shipped the same day. This offer is valid for orders shipped within the contiguous U.S. only. Frozen foods, live foods, and items shipped directly from the manufacturer do not qualify for this special offer.
This is the shipping method most Marine Depot customers are accustomed to and is really the sweet spot for service and value. Thanks to our two strategically placed warehouse locations, over 90% of Marine Depot shoppers receive their orders within 2 business using this level of service (UPS Ground).
UPS Ground shipping is available for only $4.99 but is FREE with orders over $199. This shipping upgrade speeds delivery time to 1-5 business days. This offer is valid for orders shipped within the contiguous U.S. only. Frozen foods, live foods, and items shipped directly from the manufacturer do not qualify for this special offer.
Click here to read more detailed information about our shipping policies and procedures
Transit Days
| One Day Shipping | |||||
|---|---|---|---|---|---|
| Shipped on: | Monday | Tuesday | Wednesday | Thursday | Friday |
| Arrives on: | Tuesday | Wednesday | Thursday | Friday | Monday |
| Two Day Shipping | |||||
|---|---|---|---|---|---|
| Shipped on: | Monday | Tuesday | Wednesday | Thursday | Friday |
| Arrives on: | Wednesday | Thursday | Friday | Monday | Tuesday |
| Three Day Shipping | |||||
|---|---|---|---|---|---|
| Shipped on: | Monday | Tuesday | Wednesday | Thursday | Friday |
| Arrives on: | Thursday | Friday | Monday | Tuesday | Wednesday |
| Four Day Shipping | |||||
|---|---|---|---|---|---|
| Shipped on: | Monday | Tuesday | Wednesday | Thursday | Friday |
| Arrives on: | Friday | Monday | Tuesday | Wednesday | Thursday |
Frozen foods are delivered 1-3 business days from the day your order ships. Frozen foods are shipped every Monday and Tuesday. Shipping cut-off is Tuesday at 10 am PST (1 pm EST). Orders received after 10 am PST on Tuesday will be shipped the following week. Shipping and handling is a $19.99 flat-rate charge so you can order as much or as little as you like.
Click here to read more detailed information about our frozen food shipping procedure
Orders not shipped within the contiguous United States—the 48 U.S. states on the North American continent south of Canada plus the District of Columbia—are considered international orders. International orders are not eligible for Marine Depot’s free shipping promotions and additional surcharges may apply. It is important to note that not all products we carry can be shipped internationally. Any brokerage fees, tariffs and/or taxes will be billed to you directly by the shipping courier. International customers must use the same billing and shipping address.
Click here to read more detailed information about international shipping costs and restrictions
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Buy In Bulk and Save! |
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Quantity |
Unit Price |
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1 - 2 |
$7.49 |
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3 - 5 |
$7.17 |
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6 - 11 |
$6.97 |
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12 - or more |
$6.71 |
5% Rewards:
This item is in stock in our East and West Coast warehouses
The POLY-FILTER is for filtering and purifying both fresh and salt water aquariums. It is a formulation of a special patented material bonded to a synthetic matrix. By means of a unique proprietary process, the POLY-FILTER is made impervious to salt and is also organic loving to certain materials. It can absorb and adsorb contaminants and other toxic materials found in nature or added to fresh and salt water with or without fish and invertebrates. Medication added to fresh and salt water aquariums for treatment of diseased fish will automatically be removed by the POLY-FILTER after serving their intended purpose before the medication can produce a toxic effect on the fish.4 x 8 filter pad
Poly-Bio-Marine
In 1976, Poly-Bio-Marine, Inc. developed, patented and commercialized a truly unique product, the "Poly Filter". It was specifically designed for chemical filtration in the aquarium.
No Warranty
50 Reviewers (96%) would recommend this
50 Reviewers (96%) would recommend this
We ship 99% of the products we carry for free within the contiguous United States using a mix of economy methods including USPS First Class Mail, SurePost and UPS Ground. Your order will arrive in 5-7 business days.
Over 90% of our members receive their orders within 2 business using UPS Ground. Upgrade from free economy shipping to UPS Ground for only $4.99—or spend $199 and we’ll upgrade you automatically!
Expediated shipping services are available for most products if you are in a hurry. Get guaranteed delivery in 2 business days, 1 business day, or next day by 10:30 am. Costs vary by location.
Same-day shipping is available Monday-Friday for most products—place your order by 10 am PST. Pre-ordered and back-ordered items do not qualify, nor do drop-shipped, live, or frozen shipments.
Return any new and unused item within 60 days for a full refund. Having difficulty with a product? Contact us to speak with an aquarium expert. If you need a replacement, fill out this form.
A small segment of the 180+ brands we carry require that customers contact them directly if/when problems arise. You can view the full list of those brands and get their contact info here.
Marine Depot is an authorized reseller for every product we carry. That means when you buy aquarium supplies from us, your products are not only backed by our own 60-day return policy, they also carry full factory warranties, where applicable. Some items have a 1-year warranty, others have limited lifetime warranties. Warranty coverage varies from manufacturer to manufacturer, so please read the product description of the item(s) you are considering thoroughly for details or contact us if you have warranty questions.
Rack up reward points to earn discounts on future purchases! You can earn reward points by creating an account, writing reviews, referring friends, subscribing to our newsletter, buying products, and more!
You can also get bonus reward points by purchasing select items during special sales and promotions.
If you find a product we sell for a lower price at another online store, we will match their price to ensure you always pay the lowest amount when you shop with us.
Enter the price, shipping cost and website address where you found the lower price. Then click the "Add to Cart" button. We will review the lower price while processing your order and make any necessary reductions before your order ships. Some restrictions apply. See Terms & Conditions
