I use the exact nozzles pictured size 0.28 also use very fine suction filters and very fine screens on the drains running at 110-120 psi have not had one clog yet. Please note new system needs flushed for at least 48 hours before installing nozzles. Also keep res tank spot less and sealed install bulkhead fitting to add nutes etc. they don't clog from salts nutes etc they clog because lack of keeping res clean.