P.B.!
© a.k.a. MBR
Perlite (a.k.a. Pearlite) Beds and their variations have to be some of the most versatile and simplistic yet productive hydroponics systems ever conceived. Perlite Beds can be adapted to grow plants in many configurations including ebb-&-flo, NFT, flood-&-drain, dripper-matrix, soaker-hose, pipe-action, etc..
Complete Perlite Bed units can be easily designed and built to fit any space. A large poly. tray or poly. lined wooden tray arrangement with a thru-hull fitting to a poly. or other reservoir beneath forms the basis for each unit's functionality. The nutrient solution is pumped up to the plants on top and flows back into the reservoir where it is controlled & monitored.
For larger spaces, many units can be used in unison. Each unit then serves as a modulus creating a modular expansion capability.
Perlite used alone or in combination along with other amendments such as Vermiculite, Rockwool, Dolomitic Limestone, Peat Moss, etc. is the medium used to form the substrate to support the plants roots. Combinations can be mixed to allow creation of "Zones" suitable for optimized plant growth. Perlite is cheap and easily obtained at any farm-supply or gardening nursery store for ~$10-20/110L. The media can also be bagged.
Fish-pumps and other types can be used. Magnetic-driven seem to be the most efficient and trustworthy available.
The beds can be built on top of tables, sawhorses, or other support apparatus. Minimal pH adjustment should be required with a Perlite Bed and evapo-transpiration rates can be controlled using modified substrate recipes and/or addition of landscape fabric or poly. sheeting or other mulches to the medium's surface.
The bed(s) should be rinsed regularly with clean water to avoid nutrient level fluctuations.
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