Thanks TunbridgeDave,

I ended up getting a Procon pump that puts out 240 GPH on advice from Atlantic RO. Glad to hear that the clamp style clamps have not leaked - that is what I ended up with too.

One further question about running the concentrate back to the sap tank and running until you get the sugar concentration you want - I read that the concentrate tends to drop to the bottom of the tank and displaces the sap when it is reintroduced thereby making it tough to get a homogeneous end product. Have you noticed that or do you stir the concentrate into the sap as you reintroduce it. Also, would you mind telling me what you use for tubing in your RO system?

Cheers