I'm located in Singapore and it's hard for me to find dry salts to use to fertilize my tank - my tank is about 2500 litres total volume, so using commercial branded AIO fertilizers (which is what I was doing until advised against if here) costs alot. I've resorted to looking across the border to Malaysia to source for what's hard to find locally and came across this Potassium Sulphate product (this is the same seller that I bought my Rexolin APN from). However what concerns me is that the description states that the Potassium Sulphate, rather than being K2SO4, is described as being 50% K2O and 18% S. Would this be an issue in mixing up my own AIO or should I look for another source?
This is the product: BM Behn Meyer Fruitka Soluble Potassium Sulphate (SOP) 25kg Kluang, Johor Bahru (JB), Malaysia Supplier, Dealer, Distributor, Specialist | Swee Chiang Hardware Sdn Bhd
This is an alternative that I found, would this be safer: POTASSIUM SULPHATE 500G SUPPLEMENT OF POTASSIUM & SULPHUR | Lazada Singapore
This is the product: BM Behn Meyer Fruitka Soluble Potassium Sulphate (SOP) 25kg Kluang, Johor Bahru (JB), Malaysia Supplier, Dealer, Distributor, Specialist | Swee Chiang Hardware Sdn Bhd
This is an alternative that I found, would this be safer: POTASSIUM SULPHATE 500G SUPPLEMENT OF POTASSIUM & SULPHUR | Lazada Singapore