Great Aquariums Start Here
Live Chat Support
    Free Shipping On $175+
  • FREE Shipping On $175+
  • 14-Day Low Price Guarantee
  • 14-Day Low Price Guarantee
  • Same Day Shipping
  • Same Day Shipping
FREE Shipping on
Orders Over $175
Standard ground shipping (1-7 business days) starts at a low $5.99 and most orders over $175 ship FREE. Learn More
If you find a product we sell for a lower price at another online store, we will match their price—today and up to 14 days after you've purchased the item! Learn More
Same Day Shipping
We promise to ship your order as fast as humanly possible. In fact, 99% of orders placed before 6 pm EST ship the same day! Learn More

Berlin Sump Aquarium/Water Filtration System

Berlin Sump BS-1: A sump for "Berlin" filtration system up to 125 gallons. This sump includes 3' x 1-1/4" tubing and 100 micron filter sock. Bigger internal baffle to accomodate other skimmer models. Removable baffle allowing a "refugium section" and/or increase in water volume and depth of the sump. Holds up to 12 gallons.
Reef Aquarium
Berlin Sump BS-1Berlin Sump BS-1 Diagram
Reef Aquarium
Reef Aquarium
Berlin Sump BS-2: A sump for "Berlin" filtration system up to 250 gallons. This sump includes a 1.5" bulkhead, two 3' x 1-1/4" tubings and two 100 micron filter socks. Bigger internal baffle to accomodate other skimmer models. Removable baffle allowing a "refugium section" and/or increase in water volume and depth of the sump. Holds up to 16.5 gallons.
Reef Aquarium
Berlin Sump BS-2Berlin Sump BS-2 Diagram
Item #DescriptionBulkhead SizeDimensions (LxWxH)Price 
BS1KBerlin Sump BS-1, 23 inch x 12 inch x 14 inchn/a23" x 12" x 14"$173.99
BS2KBerlin Sump BS-2, 30 inch x 14 inch x 16 inch1.5"30" x 14" x 16"$307.49
Replacement Parts
Item #DescriptionPrice 
BS1133Berlin Sump BS-1 Replacement Sponge$5.29
BS1135Berlin Sump BS-2 Replacement Sponge$9.99
Hang-On Acrylic Mount with Filter Sock
Berlin Sump Hang-on Acrylic Mount DiagramBerlin Sump Hang-on Acrylic Mount

The PVC holder secures a 1" pipe.

Berlin Sump Replacement Filter Sock
Berlin Sump Hang-on Acrylic Mount with Filter Sock
Item #DescriptionPrice 
BSAMKBerlin Sump Acrylic Mount with Filter Sock$26.99
BS1121Berlin Sump 4 Inch Acrylic Sock Holder Mount$18.99
BS1125Berlin Sump 7 Inch Acrylic Sock Holder Mount$26.99
BS1123Berlin Sump Filter Sock 4 Inch 100 Micron$8.49
BS1127Berlin Sump Filter Sock 7 Inch 100 Micron$8.99

This item is temporarily unavailable but will be back in stock soon.

Item #
Click the Add To Cart button below if you'd like to reserve this item today. Any other items included in your order will be immediately processed and shipped. We will ship this item separately as soon as it arrives. We will not charge you for this item until it ships and you will incur no additional shipping charges.

Enter your email address in the field below and click the Notify Me button if you'd like us to send you an email when this item becomes available. Although you will be immediately notified when we have stock on hand, we will not reserve any units for you; you must return to our website and place an order.

Your Email:
Just enter your email address below and we'll let you know when the product you are looking for becomes available!

Item Code:
Your Email:
Email Specials
Subscribe to our newsletter feed.
Newsletter Tips & Tricks! New Products!
Discounts & Promos!
May 6, 2015
"First of all, the employees know their products and this makes a great service. Second they have good website: informative, easy to navigate and good information and videos. This makes it a good place for all kinds of people in the hobby."

May 5, 2015
"Good selection. I've found sizes other stores don't offer. The shipping prices are very reasonable. I save by shopping here. Very satisfied. Thank you."

May 5, 2015
"Being local means I usually receive my shipments the next day, regardless of the shipping type selected. MD maintains my purchase history, so even if I don't know the type of bulbs I need, or replacement parts, they have what I purchased previously on file."

WIN A $195 RO/DI SYSTEM! Sign up for our best deals, expert tips and a chance to win a RO Junior w/ Dual DI System!