HolyIndia.Org
Thirunallar nala tirtham
And according to the Sthalapuranam there were once 13 sacred tanks here of which only five exist today. The principal one among them is Nala Tirtha which is situated on the northwestern side of the main temple. A dip in the sacred waters of this tank absolves one of all his sins and diseases and he is blessed with abundant virtues.
Since [the principal deity Darbharanyeswara his consort Praneswari, Shaniswar and the several other gods and goddesses enshrined here have the power to offer benedictions to the devotees, hundreds of them visit this temple daily. There is the additional attraction of several sacred tanks which exist here and which are said to, possess healing powers literally as well as metaboically.