I tend to use pro-mix, and no matter how much perlite I add, I seem to water only once a week and some are too dry while others still quite wet. This problem will only be compounded by using especially cow manure. Problem is, I am not a rich guy and have plenty of compost and manure. Meanwhile, to buy the quantities I would need of all these organic ammendments would be quite pricy to say the least! The manure is well composted and doesn't seem to have visible bugs in it. The question is, how do I make this safe for indoor use without lugging in all kinds of unwanted pests? And what other ingredients do I need and in what proportion (I should have called this topic "Help me devise a safe soil formula using outdoor compost and manure"). thanks