I gave Sub Irrigation Planters (SIP) a try a while back. Initial results was encouraging. However, all plants eventually had pH issues. I had to deconstruct the SIP and complete the grow top feeding them.
Flushing the medium to reset and finish by top feeding.
The medium was ProMix Premium All Purpose peat with mycorrhizae and 30 - 40% perlite added. Used Jacks 321.