I'm not sure I understand your question. Do you want to know how to prevent the electrolytes from getting dirty, or how to clean them?

i want to know what makes the electrolyte dirty to prevint it.

CO2 from the air reacts with the KOH in water to form K2CO3 = mess as it is not very soluble.

http://www.google.ca/search?hl=en&safe=off&q=K2CO3+%2Bnicad&btnG=Search&meta=

Trust you are keeping the vent plug closed. Use ONLY DE-MINERALISED water for topping. Also check the ripple content in the charger circuit of UPS. Easiest way to do is by using a TRUE RMS clamp-on meter in AC voltage range across the cable connecting to battery. Alternatively you can also see it on an oscilloscope.

Thanks and regards

Ashok Toshniwal, Bangalore, India

ODyssey Batteries ...thin plate PURE lead...AND PURE medical grade acid..

Sealed AGM...

It is very clearly mentioned that he has NiCd battery with Potassium hydroxide as electrolyte. Where is the question of lead? etc. etc.

Read the question again this time more s l o w l y !

One might consider Lithium Batteries as a replacement. I understand that LiFePO4 batteries have overcome much of the heat drawbacks of earlier Li batteries. One also obtains a higher energy density as well and likely a cycling equal to the NiCd battery without the drawbacks. It might be worth looking into.