Having built a pond with a 6 inch thick concrete base, concrete blocks for the walls which were then rendered (with "black knight" glass fibre included) . The pond is dug about 3 foot deep into the ground, with a wall section 18 inches above ground. Total water depth is 54 inches, giving a total volume of around 3200 litre (700 gallons).
I had given it 3 coats with G4 pond sealer(2 clear, 1 black). Total area of pond walls and floor is approx 15 square metres and I used 6 litres clear, 2.5 litres black. During the 4 days since painting, the pond has remained dry (no rain or ingress of water from the "water table")
I filled it up today and left the filter pump running.
After about 3 hours, the level had dropped about 4 inches (which equates to around 240 litres). This means a leakage rate of 80 litres per hour.
The level continued to drop, but there is no sign of leakage around the pond walls and the soil/clay around the poil is firm and there is no leakage at all from the pump / filter box / filter box drain / hoses.
I did not want to risk 3000 litres draining out to find the level of have now fully drained the pond, sponged out all remaining water to leave dry walls and floor. There is no sign of any water ingress (as I would expect as I have lost a total of about 400 litres of water into the surrounding clay soil).
CLose inspection of the G4 reveals no holes, blisters or other obvious damage.
Considering the amound of water loss (over 1 litre a minute), Either there should be a few visible cracks or holes, or water is leeching everywhere.
I suppose I can add another couple of coats of G4, but the instructions on the can say DO NOT leave more than 4 hours between coats.
Can I paint more G4 on top?
Any ideas? Comments??
Posted on Aug 7, 2005, 10:58 PM from IP address 80.46.150.231