Challenges for Flow Controller Chlorine Precipitation Spring 2009

Subteam Leader:

Number of team members needed:

Important team member skills:

Challenges

• Keep in touch with John and Tamar about the progress of the communities that have implemented our recommendations about addressing the precipitation problem.

• If problems persist, we recommend the addition of a settling basin located between the stock tank and the constant head bottle. The settling basin would consist of a nalgene bottle with two bulkhead fitting located approximately half way up the height of the bottle. The bulkhead fittings would direct flow parallel from a tube, into the bottle, and then out the other side. Ideally velocity would decrease inside the bottle and some of the precipitate would settle out.

• If none of the other suggestions are effective, we recommend adding HCl to the solution to lower the pH, and inhibit precipitation of calcium carbonate.