Calcium Reactors | Reef & Marine Aquarium Filteration

In-room aquarium delivery & assembly

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Collection: Calcium Reactors

A calcium reactor offers a simple and convenient solution for maintaining calcium and alkalinity in your reef tank. After the initial setup, the calcium reactor requires minimal maintenance. A calcium reactor is almost a necessity for tanks heavily stocked with stony coral where calcium and alkalinity demands are high.

Calcium Reactors Help Guides

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What Our Customers Are Saying About Us

Excellent

Based on 672 Reviews

Mike H

March 25, 2025

Excellent customer service and the delivery guy went above and beyond with pallet delivery

Peter Brook

March 24, 2025

Good service. Items were well packaged and arrived quickly.

Glenn Spiller

March 23, 2025

Great service

ian deuchar

March 23, 2025

always a quick delivery well wrapped and exactly what i wanted. very reliable

Nitromax (Nitromax)

March 23, 2025

Excellent service, has a great selection, my go to place for Aquarium items

Martyn Evans

March 23, 2025

A very swift delivery exactly as ordered.

Marco Guida

March 22, 2025

Great service a usual.

Martin King

March 22, 2025

Quick delivery, goods as described

Anns Favourites moore

March 22, 2025

As always fantastic service and products

Glyn Davies

March 18, 2025

Cannot fault the excellent service I received. I haven’t used the filter yet but I’m sure it will be fine.

Tracy Tindall

March 17, 2025

Great price and customer service

Melvin Partridge

March 16, 2025

Great ordering experience

Evan Hodson

March 16, 2025

Amazing I got so much for my money definitely will be ordering again

David Pearce

March 15, 2025

5 stars. Prompt delivery.

Lee Berry

March 11, 2025

Quick delivery, good prices and good products.

John Clothier

March 11, 2025

Great service

Steve Aris

March 10, 2025

Good communication about delayed item, although slightly earlier notification would've been even better.

Dan the man

March 10, 2025

Quick delivery and well packed

philip wilkinson

March 10, 2025

Excellent .Easy to order on web.Really good filter,have several of these running in my aquariums.This was the best price I could find for this filter online.Delivery was really quick.10/10 for service.