Thank you all for your responses regarding the granite grit. As for seed starting mixes, I'm always on the lookout for new and improved methods. I start seeds year round, when one only has an average of 112 days frost free.... I garden indoors a lot. I started off using a mix of 1-1-1, peat-vermiculite-perlite. Over the years I've reduced it to half and half of peat and vermiculite. Needless to say, I'm still looking for the ideal mix. With the perlite I found that it surfaces, and algae will grow on it easily. Now that problem was solved by eliminating the perlite, however it creates other problems. My mix is less porous. I switched to a larger grade of vermiculite. I have gnat problems every year and I'm convinced that they comes in with the peat. I'm extremely careful about cleanliness. This year is the worst it has ever been. I'm almost debating throwing out about a dozen trays of seed due to this problem. Insecticides of any sort have to be carefully researched in my house prior to use. I have allergies and we also have a parrot. I liked vectobac, the active ingredient being Bacillus thruringiensis israelensis, very effective and environmentally friendly. However I can not seem to find it anymore? I'm currently trying a product called SM-90, made by Nutrilife, which claims - 'Nutrilife's SM-90 is liquid magic for your plants. Made from plant extracts such as corriander and canola oil, SM-90 can be used in the root zone as a shield against pathogens, fungal gnat larvae, and root aphids and as a foliar spray against spider mites. Safe enough to use regularly in hydroponic reservoirs, SM-90 can act as a good method to promoting healthy roots.' Is it working? Some days I think I'm ahead of the game, other days I think they are winning. Sticky strips are everywhere. Is there something that I can replace the peat with? I love the idea of using straight granite grit as I'm pretty sure that will eliminate my gnat problems. However once the seedling starts to grow I have to put it back into a soil or soil-less mix? Still at the drawing board! and becoming one with the fungus gnats! Linda Foulis Okotoks, AB Canada