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Try www.waterirrigation.co.uk, much cheaper than Hozelock & Gardena. I'd be looking at a long stretch of 13mm supply pipe with micro-drip circles teed off to the pots.
Thanks ..much appreciated
I also use waterirrigation.co.uk for vegetable bed irrigation. Can be a bit of a mine field navigating what fits what but thier customer relations is pretty good
Again thanks..helps a lot
I've used these guys for kit - https://www.waterirrigation.co.uk/
Depending on how many drippers each pot requires, it may be worth running a 19mm. supply pipe along the whole stretch of pots with 4mm. pipe into each pot and individual drippers. 19mm. pipe will reduce the pressure loss over that distance and allow for more pots to be added at a later stage if required.
https://landscapeplus.com/Category/5/garden-irrigation
Personally I hate drippers - prone to getting blocked, particularly in hard water areas. Local specialist nursery refers to theirs as their "Irritation system"
I use a loop, or two, of leaky hose in a circle around plant / container with with a T onto the (semi rigid) LDPE feed pipe, or just a straight connector and bend/kink the leaky hose end over and cable-tie to seal it (pucker end-caps available, but cable-tie works just as well and one less Part to buy). Cable tie into a loop as well or peg down with short lengths of old wire bent into a hairpin. Where I do this for shrubs I sink a used Rose (i.e. deep) Pot alongside the plant and tuck a tail of the leaky hose into that, to get some water "under" the plant.
Then distribution LDPE pipe to get to each container / watering location/ 1/2" to the leaky hose to match its size, and depending on the length of run and water pressure 1/2" or 3/4" LDPE distribution pipe for the backbone from the supply. LDPE won't bend round a tight radius, so needs a 90-bend for that.
All my pipe is above ground / membrane so that when some critter eats through it in the winter I see the leak before the plant dies of drought.
I have bought from cityirrigation.co.uk (their website is a mess too ...) but my preference is LBS. LDPE pipe is 33p a metre, leaky hose around 70p a metre, taps (if you need to isolate a section) are 75p, Tees and Elbows 16p
So with 5M between planters and a decent loop of leaky hose it works out around £3 per planter, and I've never known one block :)
Example photo from Google, but using much more fancy fittings for connection and termination than I would as I find the cheap barb fittings work just fine.
https://www.lbsbuyersguide.co.uk/irrigation