My drip emitters keep clogging with white deposits, how do I clean and prevent it?

White or yellow deposits are usually calcium, carbonate, or iron scaling from hard or iron rich water, while slimy clogging is biological. The fix is regular maintenance plus chemical treatment. Flush the main, sub main, and the open ends of laterals at least weekly so silt does not settle. For salt and scale, periodic acid treatment (for example injecting a food grade acid to bring the line water mildly acidic, then leaving it briefly and flushing) dissolves carbonate deposits, and for biological slime a chlorine shock followed by flushing helps. Keep a clean screen or disc filter and a sand filter if you use pond or canal water, and treat iron water with aeration before it enters. Always handle acids carefully and follow the supplier's and your KVK's guidance; do not mix chemicals randomly.