Is there any benefit in toiveling in a Mikva if the filter is on and is not inside the water?

 

Usually, it will pose a problem depending on the type of filter.

One should make sure the filter is off before Toiveling, especially in regards to Tevilah Min Hatorah (such as Keilim and women).
Nonetheless, there is merit for men immersing, even while the filter is on. See references in links below.

 

See also here regarding a men’s Mikvah: 

Is there any issue for men going to Mikva on Yom Tov (in a swimming pool) with a bathing suit? Does going Mikva in a bath tub help/work?

האם יש עדיפות בטבילה בנחל שיש בו משום זוחלין על ט’ קבים במקלחת?

 

 

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