What does 0 5 4 mean? i thought it was supposed to be 20 20 20 for npk ratios.

0 5 4 means it has 0 percent nitrogen, 5% phospherus, and 4% potassium. 20-20-20 is 20% all around

Is this suitable for semi-hydroponics? i plan on using leca as the substrate

Yes. This can be used from straight hydro to soil, by following the recommended procedures. Semi hydro should probably be similar, dosage-wise, to straight hydro, I should think.

Product Dimensions	25.4 x 25.4 x 22.86 cm; 2.72 kg
Part number	HGCVB00062
Item model number	HGCVB00062
ASIN	B09M942WYB

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