GST classification of fly ash products revised: substitution of specified product entries alters notified product description and applicability. Amendment revises the Table entry for serial number 4 by substituting the column (3) description with Fly ash bricks; Fly ash aggregates; Fly ash blocks, effected under the powers of sub-section (2) of Section 23 of the Madhya Pradesh Goods and Services Tax Act, 2017, and made operative from 18th July, 2022.