Paddle wheel aerator classification: remain under HSN 8479 for mechanical water agitation; concessional GST applies via rate notification

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....Paddle wheel aerators used exclusively in aquaculture are correctly classified under HSN 84798999 because their primary function is mechanical water agitation and oxygen transfer rather than terrestrial agricultural operations; therefore HSN 8479, as a residual heading for machines with specific functions not elsewhere specified, applies and the unit remains in 84798999. Recent GST rate rationalisation granting a concessional 5% rate to aerators operates by rate notification and does not reclassify goods into HSN 8436; consequently the aerators retain their 8479 classification and associated tariff treatment. Parts exclusively used with these aerators follow the principal machine classification and are not reallocated to 8436.....