Wednesday, November 25, 2009

The best HHO Electrolyte (catalyst) for my HHO Gas Generator?

Use an electrolyte that suits the best to you HHO Gas generator design. The distance between the electrode plates does really matter.

A - For electrodes with little distance between the plates you could use: tap water or distilled- rain- or demy water with a very little of any of the catalysts mentioned below.

B - For electrodes with more space between the plates tap water won't work. So use distilled- rain- or demy water with a little of the catalysts mentioned below.

C - For electrodes with a lot of space between the plates tap water won’t work. Use distilled- rain- or demy water with a one of the catalysts mentioned below.

1 - Tap Water - H2O (containing minerals, salts etc.)


  • Available everywhere
  • Cheap
  • Safe


  • Water might turn brown with smudge on the electrodes
  • Water that contains chlorine should not be used

The best water for a HHO generator we found to be: Bottled Mineral Water

Distilled water is not recommended (any longer...)

2 - White Vinegar - acetic acid - H3C-COOH


  • Stainless electrodes stay clean
  • Available everywhere
  • Cheap
  • Safe


  • Smells
  • water will become dark

Available at your local grocery store.

A good mix for medium distance electrodes: 100% vinegar with (only if necessary) some baking soda. (If do so be carefull, because the reaction will produce co2 and some other gasses!)

2 - Baking Soda ( Natriumbicarbonate ) NaHCO3


  • Available everywhere
  • Cheap


  • Electrodes and water might turn brown
  • Produces Co2 (30%) and Co (4%).
  • For this reason not recommended

Pure Baking Soda might leave a brown tinted residu.

3 - Sodium Hydroxide also called Lye = NaOH


  • Electrodes stay clean
  • Cheap
  • 95 - 100% pure HHO (oxygen hydrogen) Gas production with right generator design
  • Available in the Grocery store


  • Limited dangerous to work with
  • Too much heat causes corrosion

Pure sodium hydroxide is a white solid; available in pellets, flakes, granules and as a 50% saturated solution. It is deliquescent and readily absorbs carbon dioxide from the air, so it should be stored in an airtight container. It is very soluble in water with liberation of heat. Use with distilled water.

Not recommended

4 - KOH

Also called pottassium hydroxide.


  • Electrodes stay clean
  • 95 - 100% pure HHO gas production along with the right generator design
  • strong and pure electrolyte


  • Not available everywhere
  • dangerous to work with

Recommended as very good electrolyte (recommended by Honda in 2001)

5 - K2CO3

Pottassium Carbonate.


  • Non aggressive
  • Reasonable / good HHO gas production depending on HHO cell design
  • Cheap
  • Safe to work with


  • It is possible (sometimes necessary) to mix it with a little Koh to draw more amps.

Winter Electrolyte:

Developed by mr. M. Moldoveanu

Water+Ethyl Glycol+KOH will provide the benefit the technical of low freezing point but high boiling point at the same time.

General information to get the best results:

Use destilled water or bottled mineral water only.

For most cars between 10 - 30 amps should give good results. Prevent to add too much watervapour into Diesel engines. Too much watervapour could delay the ignition of the fuel mixture which might cause using more fuel.

Do not try to get too much HHO gas volume out of your generator by using a lot of amps etc. It will certainly become overheated and your electrodes could be damaged. Or you will generate steam. It is better to a larger number of (small) generators to get the gas volume you need. Or use a HHO generator with a pump system. Advantages: The generators will stay cool / warm, uses less power, is safer and will last longer(!)

Your optimum draw should be several amps less when cold so keep adding little by little. until you get to your optimum amp draw. (sometimes it will double)

A few Golden Basic HHO rules in a nut shelf:

  • Distance between plates > 3mm
  • Electrodes should be made of 316 L stainless steel
  • Use distilled water and KOH for electrolyte
  • Don't exceed 1,8 volts between the plates
  • Keep the HHO Cell temperature under 50 Celsius always
  • take care of safety!

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