does the Raaved hold like Rabbeinu Yeruchem that the hashaka has to be open at the time of the tevila? i saw somewhere that it seems that he does hold like him however if this is true it would mean that The Divrei Chaim mikva would actually be no good according to the Raaved and my understanding was that the reason why the Divrei Chayim has the hashaka closed is to prevent the problem of nosein seah vnotel seah of the Raaved…thanks!
Please see the attachment, which is something that Rav Chaim blier Shlit”a wrote on the subject. This should answer your question. עצות לחשוש לדין נתן סאה ונטל סאה בבור השקה