Hi I have used Stalosan but not Staldren howeverI have I have just started using Hydrated Lime. I am lucky in that there is a distributor close to where I live and they sell directly to the public so it only costs £4.50 for a 20klg bag. It can be used directly in the pens or wherever you keep your birds (but it is can be used for all farm animals) it is a natural product & non toxic and it states that it will sanitise and helps prevent diseases and pests, even the dreaded red mite. I 'poo' pick every day but once a week I clean the coops out completely and, using a turkey baster, I spread it all round the coops and once a month I 'dust' my birds with it as well. Hope that's helpful.