HDL Online
Welcome to HDL, manufacturers of aquarium and environmental products that are at the leading edge of water technology. HDL products will provide you with a safe, stable environment for your pets.


HDL Receives New Patent -
HDL has been awarded another U.S. patent

HDL Receives Patent for "Right Now!"
HDL has been awarded a U.S. patent - Foreign Patents pending) on its revolutionary product - Right Now! - a 24 hour totally aerobic nitrification cycle that keeps fish alive. Right Now! has been laboratory proven to reduce nitrates aerobically, and is the only product on the market to do so.

Contact Us
Te reach our us call 514-694-9540, or send an email to sales@hdltd.com

We have a great testimonial from Gary Case, with some magnificent photos. Make sure to see this!
Please click here to view testimonial

In memory of those who have suffered –
Please click here to see
Mountain Suriabachi Flag Raising
28th Reg - 5th Mar Div - WW2 - USMC

New Product - AQUARIUM SPARKLING AQUA Saltwater and Freshwater Phosphate, TDS, TSS and Eutrophication Reducer. • Safe for freshwater, saltwater, ponds, tanks and reef tanks!
Find out more here.

Articles Section Updated
Our October Article has been posted - AIR, OXYGEN AND CARBON DIOXIDE.

FAQs Updated - December 14, 2002
Our FAQ page has been updated. Read the latest questions from our customers and the answers they received from HDL technical wizards.

Committed to Excellence

HDL's specialized water purification products have truly transformed how aquatic species are managed. They have been recognized as revolutionary by some of the aquarium industry's leading authorities – and are used by many public aquariums throughout the world.

Expanding to New Markets
One of the purposes of our Web site is to create new partnerships with distributors worldwide. If you are a distributor and would like to carry our products, please visit the
Contact section and fill out our online form.

A new five part videos on the Hiatt System now available on Youtube, click the links below to see the vidoes
Hiatt Filtration System Part 1:
Hiatt Filtration System Part 2:
Hiatt Filtration System Part 3:
Hiatt Filtration System Part 4:
Hiatt Filtration System Part 5:


HDL produces top of the line products. None of HDL’s products contain any VOCs (volatile organic compounds), or cancer-causing ingredients, nor are they derived from cancer-causing compounds. And all our products are 100% biodegradable. For more visit the Products section.

If you would like to purchase any of our products please visit the Orders section, where you will find an online form that will let you select the products you would like information about. After submitting the form we will promptly e-mail you our pricing and shipping information.

For more detailed instructions on how to use our products, please visit the Technical section. This section includes FAQs (frequently asked questions), and Testimonials, which are updated on a regular basis.

Also, our Technical page now has instructions on how to
start an entirely aerobic nitrification cycle in only 24 hours. HDL has developed and applied for a world wide patent, and has submitted to Nobel for Science, on a product which has the unprecedented capability to establish a Totally Aerobic Nitrogen Cycle in 24 hours (instead of 28 days) in aquarium aquaculture, as well as treat and remediate serious nitrogen pollution in large aqueous systems, whether natural or manmade. This present invention relates to new denitrifying aerobic bacterial compositions and to aerobic methods for biological treatment of aqueous systems polluted by nitrogen waste products. This paper is intended to supply sufficient information to enable the reader to understand the nature of the problem and to become acquainted with the revolutionary and superior method by which HDL's RIGHT NOW! BACTERIA solves it.

Visit the Links section for a variety of the Web's most interesting aquarium and fish sites. You will also find links to some of our many distributors.

Visit the Contact page to reach HDL by regular mail, e-mail, phone or fax. You will also find links to our Webmaster, and HDL's various Technical Wizards. This is also the place to find a special online form that will allow you to send us a description of any type of technical problem you may be experiencing with your fish. Our Lab will be more than happy to try and come up with a solution for you.

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