Does anyone sell an inexpensive fertilizer injector for in the line of a sprinkler system? Something that can be soldered into the copper pipe coming out of the wall, won't leak, and will siphon up fertilizer-water mixture from a closed bucket?
Well, it does appear from the illustration that the 'in-line' version is for PVC. However, the OP should be open to the likelihood that an adapter (hose bib or PVC or ???)may need to be soldered in place on her copper line to allow most modern plumbing accessories to be connected.
When I put in my underground system, I looked into doing just that.
While there are easy ways, there are some limitations of which you should be aware -
1) The fertilizer will be placed in the pattern of the sprinkler -, e.g., circles with the edges a lot more fertilized than close to the head. In other words - it is not evenly placed.
2) Fertilizer is active salt - it corrodes almost everything, so keep it away from metal - especially copper and galvanized pipes. So you need to flush the system by keeping the watering going after feeding
3) most fertilizers used in water are foilar - that is, they feed the leaves -leaving the roots small. So you don't get the timed release of a dry mix.
I fed my two eight-station manifolds with a pair of short pieces of 3/4" hose, put between the the vacuum-breaker-equipped spigot which is fed near the main, and the manifold. .
When I wanted to feed or treat the grass or flowers in the system, I put a Miracle-Gro hose-end sprinker in the hose junction (the flared end of the hose-end feeder screws off and you get a second hose thread). You just empty the packet into the Miracle-Gro bottle, screw it on, and turn on the water and the manifold staion to be watered.
I think it COULD be put in front of the 'manifold'(even in front a spigot) but would still need to have an anti-siphon device anyway - so likely some additional component would need to be adapted to the copper anyway. Might be the unnecessarily tricky way to do it. I'm sure it's do-able, but probably will require an NPT fitting to adapt to PVC. Either way, it's probably a job for a plumber.
The anti-siphon issue is a HUGE consideration if I understand the OP's intentions correctly.
Another thing to be mentioned is how corrosive that water soluble solution is going to be on copper. I know my hose-bib setup causes substantial corrosion on all my garden hose brass quick connects downstream from the injector.
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