You got it wrong...again, WB. If you'd read correctly, you would have noted that I usually respect your advice/solutions around here. Probably because I'm NOT an expert in ponding and DO have to pay attention myself. You'll also note I called you condescending, which you're doing with your last comment here. That's the problem. Stop doing this and it'll change your tone. But I've also seen you reply many times that you really don't care about others that way, sort of sums up your history(s) with other fora, etc. So be it. I've been around the block, too, seen/been involved with many worse than you. The arrogance is almost a given with those 'running loose' on a forum.
I told the OP about a situation that I have personal experience with. You decided I was a liar/hack/idiot ("this is why I don't think he knows what he's talking about") and began to kick the legs out from under me. Guess I should have taken the high road and just ignored you. My mistake and your bad luck. On this forum, not a lot will banter back with you because you tend to come on as 'all knowing'. This time, you haven't the chops to contend, simple as that. I've already told you YOU'RE much more informed re pond issues and I don't press in where I know less. I don't presume as much. You on the other hand, think those on another forum have more than my father's 40 years experience and are going to cling and cleave to them. Go for it. I'll take a working model and inexhaustible experience, personal and professional, over that. There's many on the net able to claim something, MOST as part of the 'sight unseen' crowd.
Seriously, HAVE you build a house? Two? Have you built the cement aquariums I outlined above? Do you have anything YOU can pony up as YOUR proof about what you were taught? I have NO doubt you do have experience in building filters, are intricately involved in ponding. I don't assail you there because NOTHING I've done can refute what you've said re ponding AND I think you've been burned by the marketing hype. You are correct in that too many pass on erroneous info simply for monetary gain. So, ask yourself; what has this BrokenSword poster to gain here? I'm not a regular as you are, I don't want to be. I help IF I have something to add. I'm a novice at ponding, still learning and growing. I probably will NEVER get to your level of involvement because I have too many other interests to also keep up with. Your place here is not in jeopardy (except when you continue to condescend; that's surely going to be your achilles heel. Used to be a forum that had a rule; don't critique the critiquers. Would be a good one here. Give your explanation and stop making it seem like so many others are fools. We're all fools sometimes; maybe this is just one time someone else points out your same ability.
Oh yeah, you wanted the last word. Please do. See if you can make someone else's day.
I'll say what I should have, again; adding a 'slurry' coat of JUST cement 'powder' (I know you hate that term, but since that's how my dad of 40 years experience called it, I can't just go and unlearn that term; have some compassion there, hey WB?) and water to the inside of a cement container will make it waterproof, provided the structure is solidly built and has structural integrity. Do it your way if you think I'm a fool, WB. At least I've seen/done it.
Michael - out