Neptune Apex Code Help?

[Enigma]

Cool!

My present chiller code is:

Fallback OFF
If Temp > 78.5 Then ON
If Temp < 78.0 Then OFF

(This works and has been tested)

But, my chiller is set to not actually start cooling until 79. It takes a few minutes for it to start cooling, so I didn't want it to come on right at 79.

I could change it to this:

Fallback OFF
If Temp > 78.5 Then ON
Defer 005
If Temp < 78.0 Then OFF


And then change the chiller pump to

Fallback OFF
If temp > 78.5 Then ON
Defer 001
If temp < 78 Then OFF
Defer 010

That should work, right?

My only concern is leaving the chiller pump off for so long. Will the water in the lines get gross? That's why I was going to let it run throughout the day, but shut off at night according to the "Sleep" outlet if not required.