Typical descaling cleaning procedure :

1st Stage : Take ‘RXSOL-11-1053-010’ weblink ( http://rxmarine.com/Alkaline-Descaler )   and mix with water in the ratio of 1:6 (One litre of RXSOL-1053 and six litres of water). Circulate the solution or immerse the equipment in this solution for 2 hrs. This will be helpful in loosening the hard deposited scale.