Cleaning a rock lined pond:
Procedure:
Basically the main pump now will pump out the water. The utility pump will be used to stir up the crud and move it to the main pump to pump out. Make sure both pumps pluged to a GFI outlet.
1] Pull the main pump from skimmer box or other pump location and attach it to the sump pump hose. If lots of large debris set the pump in a milk crate. Drain pond to level where the fish can be netted with least stress to them.
2] While this is happening and using the pond water that is pumped out, clean all bio filter mats. Cleaning the pads with city hose water will kill the good bacteria.
3] After fish all secure in the big tub, start up the utility pump. You will be pumping pond water to do the cleaning. Start at the top of the pond and using now the force of water coming out, 3,000 to 4,000 g/hr pump rate to clean. Volume of water is used to clean the crud from behind the rocks. This way all the crud will be washed down and the force is not enough to strip the bio layer off the rocks, which is what power washing does. Also washing with a garden hose is not enough water volume and it adds chlorinated water to the pond.
4] After cleaning the top of the pond rocks down to the water level, start up the main pump. You will now stir up the crud on the bottom and push it towards the main pump to pump out. Stick the hose right into the rocks. Do this until you are down to the bottom of the deepest part.
5] Fill the pond with dechlorinated water only enough to run the utility pump and give the entire pond a good rinsing. Drain all out again and you're done.
6] Fill the pond with dechlorinated water and add the fish when temps are within 2 degrees.
I have not tried this method yet, but will do it before winter to test it as I missed the spring cleanout this year. Also got some mortar residue in the water after re-doing the waterfall.
THe main advantage to this method is that most all the crud will be washed away and pumped out leaving the good bacteria layers intact. Also eliminates the messy and time consuming method of a complete drain and then sucking the crud out with a pond vac. Which also does not get the crud off the rocks, just off the bottom.
Any questions? What are your thoughts? lol