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Square plant pots (or square pots) are the most space-saving method of growing plants and are ideal for all hydroponic and soil cultures.
Sending a bag is €9.95 in Bposte point or €12.95 at home (Belgium) per bag, register on the site to see the shipping costs. Plagron Grow-Mix, growing without problems on pre-fertilised soil.
The Growth Technology pH buffer solutions are each of a known and fixed pH - 4 and 7 respectively.
pH meters need some care and attention. A little effort will keep them in good shape, which will enhance and ensure their accuracy and extend their useful life.
COM-100 Replacement Probe.