I was in big box store a couple of weeks ago and found a G CLEAN high pressure detergent injector for putting soap (their brand) into the feed for pressure washers. There is a valve for plain water or soap. If I put soluble fertilizer in the pint size "tank" I can run water until the drip lines fill and then run a dose of fertilizer. It takes quite a while for the fertilizer to empty. It was on the sale shelf.
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