Iowa Code § 628.21
In case any question arises as to the right to redeem, or the amount of any lien, the person claiming such right may deposit the necessary amount therefor with the clerk, accompanied with the affidavit above required, and also stating therein the nature of such question or objection, which question or objection shall be submitted to the court as soon as practicable thereafter, upon such notice as it shall prescribe of the time and place of the hearing of the controversy, at which time and place the matter shall be tried upon such evidence and in such manner as may be prescribed, and the proper order made and entered of record in the cause in which execution issued, and the money so paid in shall be held by the clerk subject to the order made.
Iowa Code § 628.21