Hello Flor! Thanks for reaching out. Based on your request for a water soluble poly feed fertilizer for your lettuce greenhouse, I have a few options from my search results that may interest you: The Hydroponic Water Soluble Fertiliser for R189 would be a great choice as it is designed specifically for hydroponic and greenhouse use. The 19-8-15 + Me Gg Water Soluble Fertilizer you inquired about also seems well-suited to boosting lettuce growth, but unfortunately I don't have the exact price for the 25kg bag in my search index. I hope these leads are helpful as you select fertilizers for your greenhouse. Please let me know if you need any other details.
