Calcuim Build up in sump pump & pipes

[davesatt]

Over the years I have worked on a number of houses that were constructed on top of crushed concrete. In some cases they have continuing problem with build up of calcium in the sump pump and pipes. We have measured the ph in the water in these sumps and found it to be about 8.5 to 9. Normal in our area is average 7.4. We assummed that it precipates out of the water when exposed to CO2. Does any know of a low maintance system or additive that could be used to help.

 

[monaco8774]

I am from Oil industry but we suffer scale aswell, for what its worth here is my two pence worth.

Calcium ions in the water combines with CO2 and precipitates as calcium carbonate scale.

The equilibrium between the ionic dissolved calcium ions and the calcium carbonate scale depends on pH.

The more alkaline the more scale is formed hence why at 9 you have more than at 7.

You can add anti-scale chemicals, there are many different types but they all will have running costs - contact a chemical supplier such as NALCO, Champion, etc..

 

[bimr]

The CO2 that you mentioned is actually dissolved in the ground water. When the ground water is exposed to the atmosphere, the CO2 is released, raising the pH of the water and allowing the calcium to precipitate from solution.

There is nothing that you can do, Perioidic cleaning with a dilute acid will wash it off.

 

[unclesyd]

Take a look at these people's product. As mention above a perodic cleaning is probably the cheapest way to go.

http://www.rydlyme.com/

 

[CARTECHIMICO]

U can try to decrease the set point of temperature. Calcium carbonate formation is very low under 65°C