[Alex Gardiner]

I would set it up to push through the DI vessel. I do know of several that pull it through though with no problems!

[michael papworth]

Push - without a shadow of doubt.

These pumps are not designed to create a large negative pressure on the inlet; they are designed to create a reasonably large positive pressure on the outlet.

Davids3511 is 100% correct.

[ftp]

I used to pull (ask the missus) but when i changed to push and pressured the di vessel it immediately showed up a leak that i couldn't find pulling so when the push comes to the shove i push.

[Paul Coleman]

This thread sounds like the pullmepushyou from Dr Dolittle trying to give birth.

[davids3511]

I used to pull (ask the missus) but when i changed to push and pressured the di vessel it immediately showed up a leak that i couldn't find pulling so when the push comes to the shove i push.

That's exactly where I am at right now. My once seemingly watertight setup (pulling) is now sprinkling like a fountain (pushing).

[stevekennedy]

Pumps are not designed to pull but to push. However, as long as you are using a "run dry" pump you will have no problems. Most here are using such pumps. But if it cannot be run dry then you must use it to push.

You might be able to get a siphon action going which will allow you to pull but you will likely get airlocks at times and spluttering.

I have always recommended to push it through the resin.

I thought of setting up a low pressure high flow pump for this purpose. It would then provide a feed for two standard pumps. This way you can run two pumps from one series of filters.

Think I'll start a topic on that 

[macmac]

I have 2 di's & have had them set up both ways, PUSH is the way to go. Although a system will work by pulling, you'll encounter far fewer problems pushing.

Tony