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DescriptionCDS "mychem.ch-Style" Glass Jar Experiment Kit
✔️ CDS (Chlorine dioxide solution)—easy to make yourself, whenever you need it.
✔️ Includes all the essential components in the set.
✔️ Includes step-by-step instructions.
Why this set?
In the Internet There are many inaccurate instructions circulating about the so-called “cucumber jar” method—often untested and with incorrect results.
We examined various approaches and found that:
• Instead of the promised 0.3% concentration, the result was only 0.07% (about ¼ of the target concentration).
• The pH was approximately 7.
• Important instructions regarding the disposal of leftover chemicals were completely missing.
With our kit and the included mychem.ch instructions, you'll have a safe, proven method for making CDS at the correct concentration.
What's Included• 0.5 L clear glass jar with a 250 ml mark
• 40 ml shot glass
• 100 ml of sodium chlorite ((NaClO₂)24–26%
• 100 ml of 4% hydrochloric acid (HCl)
• 3-ml measuring pipettes x 2
• 5 ml measuring cup
• 4 replacement gaskets for the pickle jar*
• HDPE funnel
• 100 ml amber glass bottle with dropper
• 250 ml amber glass bottle with a screw cap
• 100 g ascorbic acid
• Printed instructions for preparing a 0.3% solution CDS
*Note: No sealing ring is completely resistant to chlorine dioxide—so be sure to check its integrity regularly.
Manufacturing – A Brief Explanation1. Fill the beaker with water up to the mark (250 ml).
2. Pour the reagents into the shot glass and place it in the beaker.
3. Seal the jar airtight and store it in a dark place at room temperature for 24 hours.
4. Repeat step 5 five times until 0.3% CDS is achieved.
5. Neutralize the remaining solution in the shot glass with ascorbic acid and dispose of it.
👉 The result: approx. 0.32% CDS – though with a slightly acidic pH (~5).
⚠️ Important Note:
Chlorine dioxide gas is produced during the reaction. Please always work in well-ventilated areas and do not inhale the gas!
ConclusionThe pickle jar method works—but it has some drawbacks (acidic pH, potential contaminants from spray mist, limited shelf life of the sealing ring).
For maximum purity, we recommend our high-purity CDS-Products.
SafetyUFI Technical Sodium Chlorite: C600-T03S-200S-6PYX
Sodium chlorite
GHS05 GHS07 GHS09 Hazard
H290: May be corrosive to metal.
H302: Harmful if swallowed.
H318: Causes serious eye damage.
H373: May cause damage to organs through prolonged or repeated exposure.
H410: Very toxic to aquatic life with long-lasting effects.
P102: Keep out of the reach of children.
P280: Wear protective gloves, eye protection, and face protection.
P405: Keep under lock and key.
P305 + P351 + P338 IF IN EYES: Gently rinse with water for several minutes.
Remove any contact lenses, if possible. Continue rinsing.
P501: Return partially emptied containers to the point of sale or take them to a hazardous waste collection site.
EUH031: Releases toxic gases upon contact with acid.
UFI Technical-Grade Hydrochloric Acid: CS00-A0XJ-7008-U32D
Hydrochloric acid
GHS05 GHS07 Hazard
H290: May be corrosive to metal.
H314: Causes severe skin burns and serious eye damage.
H319: Causes serious eye irritation.
H335: May irritate the respiratory tract.
P102: Keep out of reach of children.
P280: Wear protective gloves, eye protection, and face protection.
P234: Store only in the original packaging.
P390: Clean up spills to prevent property damage.
P405: Keep under lock and key.
P305 + P351 + P338 IF IN EYES: Gently rinse with water for several minutes.
Remove any contact lenses, if possible. Continue rinsing.
P501: Return partially emptied containers to the point of sale or take them to a hazardous waste collection site.
Data SheetsSafety Data Sheet for Sodium Chlorite (NaClO₂) 24–26%Technical (MSDS)
Safety Data Sheet for Hydrochloric Acid (HCl) 4%Technical (MSDS)
Delivery & ShippingWe supply customers in Switzerland and the Principality of Liechtenstein.
MYCHEM.CH's terms of delivery and payment are described in detail during the ordering process. Special delivery methods requested by our customers will be charged with a local surcharge.
Ordered items will be delivered as quickly as possible depending on availability. More precise delivery times are displayed for each item and at the end of the order process.
If an item is not available, we will inform the customer immediately. If non-compliance with a delivery or performance deadline is due to force majeure, unforeseeable obstacles or other circumstances for which we are not responsible, the deadline shall be extended accordingly. If the impossibility of delivery is due to the inability of the manufacturer or our supplier, both we and the buyer may withdraw from the contract if the agreed delivery date is exceeded by more than 3 weeks.
Delivery costs/free delivery
The delivery costs are calculated according to weight and shipping method and are shown separately in the order process.
From a net value of CHF 100.00, shipping is free of charge by "PostPack Priority" or A Mail.
General remarks
There are no delivery costs for personal collection.
Special deliveries by arrangement.
Packaging costs
The cost of standard factory packaging is included in the price. If special packaging is required or is necessary for the safe shipment of an item, the corresponding costs will be charged.
Delivery area
Our articles can only be delivered within Switzerland and Liechtenstein.
Deliveries abroad for larger quantities are subject to separate agreement.
