Organic Topdressing is a blend of 80/20 Sandy Loam (80% double washed sand and 20% natural washed soil) and Chicken Manure, that helps to promote drainage whilst fertilising your lawn. This mixture provides an ideal top-dress for your lawn in the cooler months, however due to the high Nitrogen content of the Chicken Manure it is not advisable to use organic topdressing in summer as it may burn your lawn.
Recycled Turf Underlay is a budget recycled underlay which is predominantly used for fill. It is often compacted, before a top layer of sandy soil is applied. It is not suitable or recommended for most types of turf to be directly laid upon, however turf such as Kikuyu can survive on a thick layer of Recycled Turf Underlay.
Topsoil is a naturally sandy soil that promotes drainage and fast turf growth. It is suitable for using as an underlay for new turf or to top dress established lawns. Topsoil is very similar to 80/20 in all its properties, however it has a slightly lower sand content and is slightly more dense.