'''Step 5:''' The next day another coat of mortar is added until all binding wires and chicken mesh are covered with mortar. Within the same day, cement slurry (NIL) is pressed onto the moist plaster with a square steel trowel for water proofing. The outside of the tank can be painted with a weatherproof paint made of 1 part cement to 10 parts of lime mixed with water.
====Leakage between wall and foundation====
Problem: Many tanks built of masonry leak water through the joint where the wall joins the foundation.<br>
Reason: The reasons are either insufficient reinforcement, poor mixture of mortar or lack of cleanliness when the joint was made.<br>
Remedy: The joint can be made watertight by cleaning the joint, adding more reinforcement and making an apron on both sides of the joint.
'''Procedure:'''
'''Step 1:''' Drain all water out of the tank and clean the floor and the foundation on the outer side of the tank.
'''Step 2:''' Chisel a groove, about 3 cm x 3 cm, all around the joint on both the interior and external sides of the tank.
'''Step 3:''' Roughen a 15 cm wide stretch of the foundation on both sides of the joint. Clean the joint and the roughened surface with plenty of water.
'''Step 3:''' Wrap 5 rounds of barbed wire tightly around the tank in the external groove.
'''Step 4:''' Compact mortar 1:3 into the external and internal grooves with a piece of timber.
'''Step 5:''' Compact a 15 cm wide and 10 cm high apron over the external and internal grooves.
