Pool & Spa FAQS

Pool & Spa FAQS and operating instructions


1) Q) How does it work?

A) Both the MegaDisk and the MaxiDisk work through a controlled release of copper-zinc ions.

2) Q) How does it control algae and bacteria?

A) Copper is a known algaecide. The release of copper-zinc ions controls bacteria and algae growth.

3) Q) Why don’t I need to test?

A) You can test if you want to but it’s not necessary. This is because the copper-zinc disks will control bacteria and algae as well as scale and hardness and will also self regulate the pH.

4) Q) Why is the pH higher than with chlorine?

A) Chlorine works best at pH levels between 7.2 and 7.6. Our copper-zinc disks will seek their best operating pH levels. This is usually between 7.6 and 8.2. Don’t try to lower the pH with chemicals as that will reduce the effectiveness of the disks. It is recommended that you test for pH for a few days after the disk is installed to determine a base level for the pH. Once a baseline has been established you can then determine if the pH is decreasing.

5) Q) Is there a test I can perform to determine if the disk is still working?

A) Water turns cloudy because of an increase in bacteria load. When bacteria increase the pH decreases. So, you can test your water for pH and if it decreases below 7.2 and continues to decrease it’s time to change the disk. This is the reason to establish an initial baseline.

6) Q) Are there other tests?

A) You will not need to test your water when using the disk. However, you can test for copper levels and/or zinc levels. These levels will also diminish as the disk wears down.

7) Q) What happens if my pool or spa turns cloudy?

A) Under normal circumstances the water in your pool or spa should be clear. If the water turns cloudy it could mean that the disk(s) is not seeing enough water. Increase the amount of time your pump runs to increase the contact time that the water has with the disk. MAKE SURE THAT WHEN WATER RUNS THROUGH THE DISK THERE IS NO SUCTION ELSEWHERE. If the water remains cloudy it might be time to replace the disk(s).

B} The copper-zinc disk will work on existing scale changing it from a hard scale to a “soft” scale. During this process the “soft” scale will flake off and dissolve into the water. The dissolved scale can make the water appear cloudy. If this is the cause of the cloudiness in the water, use a finer (smaller) micron size sediment or sand filter to clear up the water, or use a coagulent to clump the molecules together for easier physical removal.

8) Q) What are NOT Normal circumstances?

A) Excessive bather load, meaning too many people in the pool or spa at once, unusual climactic conditions, meaning excessive rain or heat, and animals swimming in the water are all considered not normal operating conditions and can cause a sudden, dramatic increase in bacteria load. A sudden increase in bacteria could overwhelm the system and cause the water to turn cloudy.

9) Q) If a condition occurs how do I get my water back to normal?

A) If the water does not clear up by itself within 24 hours of continual use of the disk you should do a mini-shock to diminish the bacteria load so the disks can resume normal operation. Remove the disk during the shocking period.

10) Q) What is a mini-shock?

A) A mini-shock is using a dose of your shocking agent for a 24 hour period to diminish the bacteria load. Remove the disk from the pool or spa during the shocking period.

11) Q) Will I need to treat my water in any other way?

A) When using the disk no other treatment should be necessary. As a matter of fact, using chemicals will diminish the efficiency of the disk. However, many customers will do a mini-shock anywhere from once a week to once every six weeks to not at all just as preventative maintenance. Whenever you mini-shock make sure to remove the disk and return it after 12 hours.

12) Q) What if my pool or spa suddenly turns green?

A) There is nothing in the disk to cause your water to turn green. More than likely some nitrogen based compound (fertilizer, herbicide or pesticide) has found its way into your water. There are some special chemicals which you might need to use to remove the nitrogen compounds. Consult your pool or spa expert. Remember to remove the disk from your pool or spa during treatment.

13) Q) How do I know when the disk stops working?

A) Your water will turn cloudy and will not recover. Unless this is a result of the unusual conditions listed elsewhere which might require a mini-shock, this is the first sign the disk might be reaching the end of its useful life. You can also test pH levels. ( See question # 5)

14) Q) What does it mean when the disk starts to get dark?

A) It is normal for the disk to get darker in color. This actually shows that the disk is working. During the oxidation process the disk will darken as it gets used.

If you have more questions visit our website at www.cuzn.com and send us an email. Enjoy your chemical free swimming and bathing.


1) We suggest that, at a minimum, water in a pool or spa circulate for 12 continuous hours at a flow rate of 10 gpm in spas and whatever the normal flow rate is in pools. It will be necessary for all the water to flow through the disk during this time, with no suction occurring other than at the skimmer or wherever the disk should be placed.

2) The disks are self-regulating when it comes to pH. Most of the time they will regulate between 7.6 and 8.0. Occasionally they will hover around 7.4 or 8.2. If you use chemicals to control the pH, the efficiency of the disk drops severely.

All of the pH parameters given for “normal” operating conditions are predicated by what’s optimal when chlorine is used. Because our disks operate outside those parameters, i.e., without chlorine, it requires a different mindset which may take some getting used to.

3) With regard to the softening aspects, the principal culprit of hard water is calcium. Our systems do not remove calcium. They change the cellular morphology so that the calcium cannot adhere to a surface and flows through in the water stream. Therefore no scale deposits will develop and the water will behave as soft water.

If, however, you were to do a test for soft water, it would show no change because the tests cannot distinguish between the different aspects of calcium.

There are no health issues or other ramifications regarding the water softening properties of the disk. The calcium cellular structure changes so it can’t adhere, and that’s the basic mechanism. If you try to control scale by using chemicals, the efficiency of the disk drops dramatically. In a normal operating condition using the disks, no chemicals are needed for softening.

4) The MegaDisks for pools comes with a black disk guard. This guard is designed to capture sediment. If the guard get clogged it will diminish the water flow into the MegDisk. Make sure the guard is kept clean. This is easily done by peeling the guard off the MegDisk, cleaning it with water and placing it back across the top of the disk.

5) The MaxiDisk for spas does not come with a guard. Typically, there are sediment filters in a spa which will remove debris, soap, shampoo or oil. However, you should check you MaxiDisk to make sure it is not being clogged by any of these things as it will reduce the water flow and exposure to the MaxiDisk. If you notice any debris or material beginnng to obstruct the disk, remove the Maxidisk, clean it with water and place it back into the skimmer.


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