Abstract: A hydroponic conduit can be converted to drainage conduit by providing an attachment on which a plant container can be supported. The attachment comprises a circular plate on which the plant containers sits, drainage means (ribs, grooves etc.) and a central aperture in the circular plate to allow water to drain from the circular plate, and a short collar or spout on the bottom of the circular plate which passes into an opening in the hydroponic conduit to allow water to drain into the conduit. A second support means can be provided which is attached to the hydroponic conduit and which provides additional support to the attachment.

Abstract: A gas and heat exchange apparatus including at least one substantially vertical elongate hollow member, a plurality of internal members spaced inside the at least one hollow member, each internal member having at least one opening, structure for gas intake and exhaust in fluid connection with the at least one hollow member, structure for draining the at least one hollow member and a structure for adding liquid to the upper end of the at least one hollow member.

Abstract: A gas and heat exchange apparatus comprising at least one substantially vertical elongate hollow member, a plurality of internal members spaced inside the at least one hollow member, each internal member having at least one opening, means for gas intake and exhaust in fluid connection with the at least one hollow member, means for draining the at least one hollow member and a means for adding liquid to the upper end of the at least one hollow member.

Abstract: The present invention aims to alleviate at least one of the abovementioned disadvantages and to provide a hydroponic apparatus which will be reliable and efficient in use. Other objects and advantages of this invention will hereinafter become apparent.

Abstract: The present invention aims to alleviate at least one of the abovementioned disadvantages and to provide a hydroponic apparatus which will be reliable and efficient in use. Other objects and advantages of this invention will hereinafter become apparent.

Abstract: Hydroponic apparatus comprising an elongate hollow conduit (2) of substantially elliptical cross section having inlet (8) for introducing a nutrient solution into the conduit, outlet (10) for allowing nutrient solution to exit the conduit and at least one opening (4) formed in the conduit through which a seedling (18) may extend, at least some of the seedling's roots being retained within the conduit. The elliptical shape of the conduit provides enhanced plant growth by allowing better lateral growth of the root ball and increased contact of the root ball with the nutrient.