Seems to be the cheapest 5L moss/mould killer at the moment.
Free Delivery For A Wide Range Of Auckland & Christchurch Locations
Delivery postcodes
https://cdn.shopify.com/s/files/1/0789/7759/7761/files/Auckl…
https://cdn.shopify.com/s/files/1/0789/7759/7761/files/Chris…
Pretty good deal. 10%/wt Benzalkonium Chloride.
You could buy Benzalkonium Chloride from The Sourcery (including the 10% off new user discount) for cheaper, although you'd have to dilute yourself. (https://thesourcery.co.nz/products/benzalkonium-chloride?var…)
5l @50%wt =25l @10%/wt = $112.90 inc del.
Moss Boss = 25l @10%/wt = $125 Inc del