New Delhi, Nov 1 (PTI) Gross GST collections increased 23 per cent to over Rs 2.31 lakh crore in October, driven by strong mop-up from domestic activities and imports, according to government. India's gross Goods and Services Tax (GST) collections rose 23 per cent year-on-year to Rs 2.31 lakh crore in. Domestic GST revenue grew 15.8%, while net GST revenue rose 25.6%. Refunds increased by 6.5% during the month.