Certified Seal
Dogs Cats Fish Birds Reptiles Small Pets Pond
Tunze Osmolator Calcium Dispenser 5074
Click to Image Zoom

Tunze Osmolator Calcium Dispenser 5074

In stock: Order by 2PM EDT for same-day shipping (M-F only)

Item #: TZ4113

MSRP: $151.99 Save: $44.50 (29%)
Qualifies for FREE Shipping!
Add to Wishlist

Quick Overview

If you have corals in your aquarium, you should know that calcium is a very important part of their skeletons's growth and formation. Without enough calcium in the water, the corals will not be able to develop strong and complete ...
Product Description

Tunze Osmolator Calcium Dispenser 5074 Information

Product Manuals & Documentation

Part #: 5074

If you have corals in your aquarium, you should know that calcium is a very important part of their skeletons's growth and formation. Without enough calcium in the water, the corals will not be able to develop strong and complete skeletal systems. So what do you have to do? Make sure there is enough calcium in the tank.

But where will you get the calcium? You can't exactly dump milk and toothpaste in your aquarium. Well, look no further because the Tunze Osmolator Calcium Dispenser is here.

Tunze Osmolator Calcium Dispenser from Pet Store first dissolves calcium hydroxide in the water inside the dispenser before being released in small amounts, all of which are done in regularly spaced-out intervals. This is done automatically, and all you have to do is to make sure that the dispenser has a constant supply of calcium hydroxide. Refilling the dispenser every two weeks is the norm.

You can install the Tunze Osmolator Calcium Dispenser in practically any kind of water tank. It is not bulky in any way so it isn't hard to find a place for it. It is also usually paired with other devices such as Osmomat or Osmolator, both products from Tunze. As part of a bigger system, this dispenser is very affordable.

Due to their growth, corals and algae consume the calcium dissolved in the water. The deficit caused can be compensated by the use of a calcium dispenser filled with calcium hydroxide and water. Conventional plants consist of large tanks with stirrers used to keep the milk of lime in constant movement, which however are bulky, require a lot of maintenance, and are expensive.

TUNZE Aquarientechnik GmbH has developed an inexpensive device to be operated in combination with the Osmolator 3155 or Osmomat 5024, which is able to produce the kalkwasser that is discharged into the tank continuously at a constant pH value. Together with the constant water level regulator, the so-called Osmolator, consisting of a metering pump and a storage container, the ideal solution was found.

By means of a screw, the Calcium Dispenser 5074 is easily fitted to the storage container of the Osmolator, and is attached between the hoses.


During the metering process, the fresh water automatically mixes with the calcium hydroxide in the dispenser. Thus, without an additional pump and stirrer, saturated kalkwasser is produced which is pressed into the tank by the metering pump. This process is repeated automatically with almost no servicing required. The consumed calcium hydroxide only has to be refilled, i.e. approx. 15 to 60 grams (.52 to 2.1 oz.) per week as needed. Refilling is done in next to no time. Unscrew the cover; fill in the calcium hydroxide; screw on the cover; shake the unit; and after a few minutes the plant with the automatic refill system continues to operate highly effectively, and it is fitted safely in the storage container, preventing any water damage.

Dimensions: 14" H x 3-1/4" D


Manufacturer`s Warranty: 1 year from date of purchase.
+ Display More
- Display Less

Tunze Osmolator Calcium Dispenser 5074 Reviews

Average Reviews

Customer Reviews

Relable Product Review by LOUIS SHRIBER (Posted on 2/26/14)

Comments: I have had this item and the Tunze top off system for three years. It is well made, reliable and the design is sophisticated. The only drawbacks are:
1. Other reviewers are correct. It would benefit from some sort of stirring mechanism. I'm toying with the idea of fitting a small pump activated by a timer to stir the contents briefly once a day.
2. It is important to keep the optical water sensor clean. this is mentioned in the directions, but one's memory can fail. The back-up high level sensor will save you, but it too should be periodically checked for proper operation.

OK for some...but. Product Review by DAVID G. (Posted on 4/21/08)

Comments: I bought this as an easy way to dispense Kalkwasser in conjunction with the Tunze Osmolator topoff unit I purchased. Basically, water enters the dispenser from the bottom, and water exits into your sump/tank thru the top.

After about a week I took mine out and bought a Kalkwaser stirrer instead for a lot more money.......the issue? My tank is an SPS type reef and it uses a lot of calcium..so this product was not up to the task. I believe that this would work well in an LPS, mixed (Soft/LPS), or soft coral type tank where the rate of calcifiction is less.

Anyone wanna buy a slightly used kalkwasser dispenser?

Items Similar to Tunze Osmolator Calcium Dispenser 5074