I use 1 pump a 10,000L/H one to pump into my chiller and from chiller into spray bars.
40mm fittings were an absolute pain in the arse. When filled with water they sag and can cause leaks.
But anything smaller and its very easy to block them with roots.
The roots were perfect mate. Filled the bucket and had no issues at all.
I'm remaking the system in 4 months after this grow.
Using Jessie's square sprayers but keeping them all 22mm
And same return pipes.
I'm also moving boxes closer to fit 4 in the tent and having the reservoir in a 35L box rather than a 64L.
There's a lot of wasted space in the tent at the moment.
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