Accurate description recipe find here http://mx5-kevin.blogspot.com
More info in the amateur Pyrotechnics and chemistry forum http://pyroprojektek.org/index.php?/blogs/entry/7-how-to-make-potassium-perchlorate-kclo4-full-video-toturial-and-description

Sodium Perchlorate Naclo4 cell parameters: 1g Nacl+2,8g H2O (saturated NACL solution at 20°C) Ph 6-7 cell temperature 20-45°C chatode pure graphite,anode PBO2 lead dioxide 6V 4A 150g Nacl+420g H2O Run time 3 week.

using the double displacement reaction

Solutions:1g kcl+2,9g H2O (saturated solution at 20°C)
1g Naclo4+0,5g H2O (saturated solution at 20°C)

Potassium perchlorate Kclo4 double displacement reaction 1g Naclo4+0,6g KCL minimum 85°C mixed the solutions.

How to make potassium perchlorate KCLO4 at home toturial from sodium Perchlorate with electrolysis.