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About Us

With well over 1/2 million units sold, Green* Killing Machine is one of our best selling product at AA Aquarium. Whether you are shopping for GKM to treat your green water problem or looking for spare parts, you can easily order here and have it delivered right to your door. Shipping from Connecticut is free for orders over $50.


We are also proud to add Cat H2O & Dog H2O to our range. They are stylish pet water fountains with all new Dental Care feature built in. Pets can have their mouth cleaned while simply drinking water!


This website operates as a division of AA Aquarium Inc. However payment with PayPal is handled with Sealand Holdings Co., Ltd. (our associate company based in Hong Kong). Payment is easy & secure with PayPal, we do not have details of your credit card.


For more details about our full range of products, please visit:

* Controls Green Water

AA Aquarium
Cat H2O
Dog H2O


Do you provide International delivery?

No, this online shop only caters for orders within the US.


How do I return an item?

Merchandise may be returned or exchanged within 14 days of delivery with an original packing invoice. The returned merchandise must be in new, unused, and in the original packaging. No returns, refunds, exchanges, or credits will be issued without the original packing invoice.

Shipping charges are non-refundable. All returns and re-shipping charges are at the customer's liability.


For items being sent to our Returns department, please be sure to ship your item by recorded mail. Please include a note with your address and daytime phone number along with your instructions and a copy of your invoice, and send to:

Attn: Online Department
SC 29585

What is the usual shipping time?

Your order will be acknowledged processed within 48 hrs depending on stock availability. It could be shipped to you from us or from the manufacturer. Please allow seven (7) to fourteen (14) working days for delivery. If you do not receive your order within this period of time, please email us at

What if the product is a defect?

Please report any visible damages and discrepancies within 7 days of delivery. If your merchandise is damaged when it arrives, please e-mail us describing the condition before you return it. Best if you can support your descriptions with digital photos.

Cash refunds are only issued for defective merchandise or merchandise sent in error. Please ensure your request is made within 30 days of purchase. Refunds cannot be issued after 30 days.

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