C5 Chlorine Dioxide Precursor Tablets (2kg – 10kg)

C5 Chlorine Dioxide Precursor Tablets (2kg – 10kg)

Sodium Chlorite and Inorganic Salts
C-5 Tablets are a blend of precursor chemicals, which when added to the pool, water forms Chlorine Dioxide (CLO2)
This is ideal for the elimination of cryptosporidium and chloramines.

Another benefit fo this product is that there is little ‘downtime’ for the swimming pool, as there is no need for chlorine reduction after use.

Use this product in conjunction with the IQ Smart Check Bacteria Test Strips to detect bacteria in the pool. Use the Palintest ChlordioXense Test Kit or Chlorine Dioxide Test Strips to ensure chlorine dioxide levels are maintained during treatment.

Cryptosporidium is a parasite that can cause serious health problems, such as Diarrhoea, Nausea, Vomiting, Abdominal Cramps, Fever, and more. If the affected person has a weakened immune system the infection is more severe and could be fatal.

The usual cause of this sort of contamination is by the presence of a loose (liquid) bowel movement into the pool water. C.Parvum oocysts are best treated by a combination of chemical treatment (inactivation) and filtration (removal).

The effectiveness of removal by filtration will depend on the efficiency of the filtration system (filter media/filter bed depth, condition/filtration rate, etc.). Coagulation will assist in optimizing the filtration of Oocysts.

The actual efficiency of chlorine on its own is still subject to debate around the world. The use of additional systems such as U.V and/or Ozone may greatly enhance the results, but that is also to debate.

Health Guidelines recommend Super Chlorination as a means if inactivation.
A CT value (Free chlorine (mg/L) x Time (minutes) ) of at least 15300 must be achieved in order to inactivate 99.9% of Oocysts. This equates to a Free Chlorine reading of 20mg/l for 12.75 hours or 10mg/L for 25.5 hours. (e.g. 12.75 x 20 x (60 minutes) = 15300. Following this chemical treatment and prior to re-opening the pool, all filters should be backwashed to remove Oocysts and then the Chlorine residual should be reduced to normal levels by the addition of Sodium Thiosulphate.

An alternative method that is also recommended by Health Departments around the world is the use of Chlorine Dioxide. This may be used as both a preventative and an in-activator of existing Oocysts. It is generally accepted that a CT value of just 78 (using Chlorine Dioxide) will result in the inactivation of 99.9% of Oocysts. C-5 Tablets is a Chlorine Dioxide precursor which when activated will form Chlorine Dioxide in the pool water.

In the case of a suspected outbreak of Cryptosporidium, we recommend a Chlorine Dioxide level of 1ppm be maintained for a period of at least 2.6 hours (CT 1 x 2.6 x 60 (minutes)) = 156, Normal chlorination levels (1-3ppm) should be maintained. At the end of this period, all filters should be backwashed to remove Oocysts.

NOTE: NO neutralization of Chlorine / Chlorine Dioxide is necessary. During treatment, it is important that all probes are isolated.

Dose Rates
Application rate
C-5 to achieve
CLO2 (ppm)
Water Volume (Litres)
ppm 10,000 50,000 500,000 1,000,000
0.4 N/A 2 Tablets 20 Tablets 40 Tablets
1.0 1 Tablet 5 Tablets 50 Tablets 100 Tablets


    Select Size

    10kg-bucket N/A
    2kg-bucket N/A
    Brand: International Quadratics,
    Type: Pool Chemicals,

    Out of stock