Enables ammonium transmembrane transporter activity and potassium:chloride symporter activity. Involved in several processes, including cation transport; dendritic spine development; and intracellular pH reduction. Located in dendrite membrane and perikaryon. Human ortholog(s) of this gene implicated in developmental and epileptic encephalopathy 34 and idiopathic generalized epilepsy 14. Orthologous to human SLC12A5 (solute carrier family 12 member 5). [provided by Alliance of Genome Resources, Apr 2022]