Could someone tell what is this Pos-thing? I get 8% of my wallet coins for free if I run my computer (what a waste of energy) for 20 days with wallet open? And after that 8% after 20 days etc? And what is pow?
You don't have to keep it open for 20 days. Just make sure to open it every 20 days or so, and don't move the coins around to other wallets or exchanges if you don't need to, as this will reset the age of those coins.
Basically, after 20 days, you can magically create interest coins. The more WATER you have, and the older those coins are, the faster they will find a POS block and mint for you while your wallets open. Once all the minting is done, you can close it down again for 19-20 days if you want to. Or, leave it open to contribute to the network.