This BIO-Lime for Lawns by Viano is a high quality lime lawn fertiliser that raises the PH level from acid to alkaline which encourages growth, creates healthy lawns and prevents moss infestation.  The lawn fertiliser also boasts magnesium which creates far tougher and greener grass.   When lawn becomes more acidic, it creates an unhealthy environment for grass which is the reason why moss forms - with BIO-Lime the added magnesium provides a healthier environment for the soil which releases more nutrients into the grass and creates a much greener colour rather than the yellow that often occurs - and it also gets rid of the moss.    The product should be used in combination with other lawn fertilisers and is endorsed by the RHS. The typical life cycle of the products goes as follows Step 1: Apply Bio-Lime Winter - early Spring Step 2: Apply MO Bacter - Spring / Summer Step 3: Apply Recovery - Spring / Summer / Autum Step 4: Apply Mo Bacter - Late Summer / eary Autumn Step 5: Apply Bio-Lime - Autumn / Winter    It is advisable to use this product twice a year - once in Spring and once in Autum - and please use gloves too. The product comes in a 5k box and can treat up to 100 square metres.    Bio-Lime is a granular lawn fertiliser for spring or autumn which raises pH, sweetens the soil and encourages healthy strong grass growth. Bio-Lime also contains friendly bacteria which eat thatch and dead moss eliminating the need to rake or scarify. It also contains magnesium which helps maintain a strong colour throughout the winter months. Available in two sizes: 5kg covers 100 sq m, 20kg covers 400 sq m. As your lawn grows it takes up nutrients from the soil, normally leading to a reduction in pH (making it more acidic). Rain usually increases acidity further, creating an unhealthy environment for grass. Nutrients become locked, the lawn will not respond to feeding and watering and moss will thrive.