Alarm question

[Wes300]

I have 2 leak detector switches. This is the code for them.
Set OFF
If Swx11_1 CLOSED Then ON
If Swx11_2 CLOSED Then ON
If Swx4_3 CLOSED Then ON
If Swx4_4 CLOSED Then ON
They work but the problem is the apex goes crazy and will constantly send email and texts non stop till the problem is corrected. How do I go about a single alert and then like another every 15 minutes until corrected?
I am assuming its with a defer line but I have no idea on how to go about it.
Thanks

[zombie]

Defer 000:30 Then ON
Defer 015:00 Then OFF

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