Sodium-independent anion exchanger mediating bicarbonate, chloride, sulfate and oxalate transport (By similarity). Exhibits sodium-independent sulfate anion transporter activity that may cooperate with SLC26A2 to mediate DIDS-sensitive sulfate uptake into high endothelial venules endothelial cells (HEVEC) (PubMed:12626430). In the kidney, mediates chloride-bicarbonate exchange, facilitating V- ATPase-mediated acid secretion (By similarity). May function as a chloride channel, playing an important role in moderating chloride homeostasis and neuronal activity in the cerebellum (By similarity). {ECO:0000250|UniProtKB:G3C7W6, ECO:0000250|UniProtKB:Q80ZD3, ECO:0000269|PubMed:12626430}. This is the function of SLC26A11 (solute carrier family 26 member 11, Ensembl gene identifier ENSG00000181045).