depends on how you look at it,you ever throw compost in a pile of leaves?those filters will decompose also and dont know about you but all my indoor plants only max out at 8 weeks other than my sativa at 12 to 14 weeks,there aint no salt buildup when you feed organic fertilizers you made from your own hands,so get it right before passing judgment,i wont you to show me in a picture a pot of living soil that when you run several gallons of water threw,that is not compacted? show me and i will withdraw my comment,the only damn flush you CAN do is week or so before harvest feed nothing but water ,that is also a cure for your bud,get it,the water wash away any life,then you have to build up the bioloigy again and that takes a minute if you dig,so there for your left with a big ole mud pie,and by the time it drys out as you claim,you have already drowned most the roots,thats why the water guys add air to res,for oxygen,get that oxygen,show me oxygen after you put 10 gal water in threw a pot that someone was quick to say flush,not in soil friend,coco,
promix,dwc and hydro,flush away you will get the problem straightened out,in soil you just put them [plants in shock at the most critical time of there life,now thats my opinion,check out korean natraul farming and you will see what it takes to make food and teas,great system,and as cheap as it gets,thanks for writing me with that though,brings minds together if you dig,mine is tried and proved since 1976 hasnt failed me yet