# \#open-loop

**URL:** https://forum.fudiabetes.org/tag/open-loop/626.md

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## [How well do closed/open loop algorithms deal with Dawn Phenomenon or FOTF](https://forum.fudiabetes.org/t/how-well-do-closed-open-loop-algorithms-deal-with-dawn-phenomenon-or-fotf/16174)

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**Author:** [@CarlosLuis](https://forum.fudiabetes.org/u/CarlosLuis)\
**Replies:** 24\
**Last updated:** [July 7, 2026, 4:28pm UTC](https://forum.fudiabetes.org/t/how-well-do-closed-open-loop-algorithms-deal-with-dawn-phenomenon-or-fotf/16174 "2026-07-07T16:28:02Z")

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I used the Tandem T:Slim with Control IQ. The pump does not really work for rises in BG because of DP or FOTF. As an example this morning my BG was up to 120mg/dl. I requested a bolus and the suggested based on my CF wa…