Pump/Filter Sizing Mytery

[Vinyl_Guy]

We need a picture.

The higher the resolution and more detailed the better. If you are not able to upload it to a location, I can provide one for you if need be.

I'm thinking this is not a standard gunite pool, and if it is, it's just been through so much that it doesn't resemble one anymore.

I have a hypothesis that at the lowest the water will only drop to the level of the shallow end, which was dry when we first looked at the pool - the rest of it was full. The pool had not been touched in probably 2 years. We walked in the shallow end and launched massive chlorine bombs from the water's edge, which was actually where the drop to the deep end took off.

That's very telling. Sounds like this fiberglass type thing I've yet to wrap my head around, could be the cause of a majority of the problems, when talking water loss.

Cracks appear to be from about an 1/8th anywhere up to 3/8", maybe even 1/2", but I don't think that bad. I have two cracks in the bottom I have spotted that run the whole width of the pool (expansion joints?), plus a few other, lesser faults.

Purposeful "expansion" type joints would only occur in a concrete pool and not a plastered gunite pool (maybe rarely).

Is the pool "painted" that you can tell? That's a dead give away of "concrete construction", of some type. Or is the "bottom" (shallow end floor,drop off, and deep end), a white (possible not pure white) smooth substance?


Your idea for the landscaping drains sounds about right but remember there's also a large volume of water that is shed from that section of deck too. Getting at the water as it comes down your hill is good, but the water that falls onto the deck and then is shed back to that area can cause just as many problems behind the walls. Although it's probably the much lesser amount of water compared to the hill it could still be enough to cause problems.

But dig this: This pool is 40' long. There are two serious cracks in one deck - the "hill" side - that both run on a slight diagonal outward, from the pool rim to the edge of the deck: imagine a shape with one side 18' long, the other side 20' long, with symmetrical ends angling out from the short side to the long side (the "hill" side.) They both start about 11' from the ends, measuring to the "short" side if you follow me. And the concrete between these cracks is dropped about 3/4", maybe less- I haven't actually measured any of this precisely.

Are these diagonal lines/cracks perfectly straight? If so the deck has dropped right at the point it was predicted it would happen after the pouring of the deck. This would have been a different kind of "expansion joint", a relief joint. It's a weakened indentation, cut, or "score" in the concrete put there to make any pressure that will eventually crack the deck occur in a uniform manner. Think of the sections of concrete side walk. Even though the lines in them might not extend all the way through the concrete that is where they will most likely crack when "heaving" happens. If they (the diaganol lines) are not perfectly straight then they probably left them out. Which is right were they are normally put (diagonally at the corners), and periodically in long stretches too.

Finally, concerning the returns, I have slightly fizzy, bubbly flow from the jets. Hopefully they are all okay because they are certainly deep.

That's most likely not a problem with the return line. Rarely will water being pushed through a return line, pick up air from that line and dispense it into the pool. A return line is more likely to push the water out of any "leak" while running. Air at some point is being introduced into the loop and thus being fed into the pool. Air most likely can't be introduced into the system with out it being "sucked" in. So water leaking from your filters, pumps or other systems topside are probably not the source (believe it or not), those are places water is being "pushed" out. Valves, threaded fittings, loose clamps form the suction of the pump, on out, is probably the source of the bubbles.

If you can see the bubbles in a your pump "chamber", try this: Get a watering can or garden hose that you can regulate. Start where the suction lines come up out of the ground and trickle (pour till the fitting has water all around it, and continue to do this) water on any fitting (elbow, coupling, bushing etc), and valve. See if the bubbles go away or are reduced as you trickle the water all around these "connections". What happens is, the constant flow of water effectively seals the air leak temporarily. It might be in several places, so it make take trickling water on two different ones. Work your way back to the where the suction lines ends up at the pump. Even this fitting might be the culprit. Or any lid, threaded plug or other thing in the pump body itself.

Like I said though at this point I think we need a picture. I still can't picture (no pun intended) this fiberglass type section your describing. I think I understand "where" it is, but why it's there and what its function is, I have no idea. Could it possibly be a section where the plaster/gunite/ or concrete has actually completely failed and dropped away?

If you need help figuring out how to get a picture here (on the forum), or to me, we can work it out. Emailing me is activated in this forum as well as several Instant Messenger services I use.

[kingbud]

Edit by Watermom: Kingbud -- a family-friendly forum, please. I deleted the questionable references to the previous owners.
Last edited by Watermom : 09-16-2008 at 07:45 PM.

Watermom- oops, sorry... it won't happen again. Somewhere in scripture it says, "If a just man correct or reprove me it is a kindness." I think that applies here. (btw, I can't figure out how the Quote feature works)

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Hey Vinyl Guy: Thanks for your excellent advice and counsel. Watch this space.......

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[Watermom]

Thank you, Kingbud. We appreciate your good attitude and hope you understand our reasons for trying to keep the forum clean.

[kingbud]

An interim response while I'm working on the camera deal

The pool is definitely painted (blue green) and the transverse cracks I mentioned were not intended or planned. They meander in a sort of lazy, curvy fashion all the way across the width of the pool. I mentioned "expansion" joints because they look like they might have served, or do serve, that function.

re: cracks in deck: "Are these diagonal lines/cracks perfectly straight? If so the deck has dropped right at the point it was predicted it would happen after the pouring of the deck. This would have been a different kind of "expansion joint", a relief joint."

negative; I see what you are saying, but the cracks are quite jagged. I'll shoot a picture of them. Interesting that you say that this would be the right location where a builder would normally have put expansion or relief joints. I'll have to ask the builder. The striking thing about these are the relative uniformity, and the size of the chunk of real estate that they border - you really see it from a ways back.

re: air in returns: That's most likely not a problem with the return line. Rarely will water being pushed through a return line, pick up air from that line and dispense it into the pool. A return line is more likely to push the water out of any "leak" while running.

Your explanation concerning the returns makes good sense... I'm gonna call that (tentatively) good news. The procedure for wetting the joints on the supply side makes good sense, too. However it's too late for that, the level is below the skimmer so I can't operate the pump. I'm gonna test the suction line from the skimmer (that's all there is anyway) and if it holds, great, otherwise I'm pretty sure I know where to dig. Any suction pipe from the ground up is going to be replaced when I put in the new pump anyway. I suppose I ought to cut off the suction pipe from the main drain and cap it while I'm at it, since I'm going to abandon it -- maybe I'll test it first and use dye or watch for bubbles to see if those plugs are holding. Does any of that make sense? I guess if I cap it off and abandon it, what difference would it make?

I guess that's about it until I take some pictures. I plan on showing you the "relief" cracks, the hill if I can figure out how to get you a good perspective, the lateral cracks, and of course the fiberglass...

Oh, by the way, in my first conversation with the builder he gave me the impression that this type pool, with the fiberglass side walls, is typical for them. Can't wait to get your "views", after I have sent you something to view. Oh heck, when can you just fly out? A week from Sunday I could take you to a Chiefs game (v. Broncos). Ha. Ha Ha HA. Ha Ha.... Ha Ha Ha Ha Ha Ha...........................

[Vinyl_Guy]

An interim response while I'm working on the camera deal

The pool is definitely painted (blue green) and the transverse cracks I mentioned were not intended or planned. They meander in a sort of lazy, curvy fashion all the way across the width of the pool. I mentioned "expansion" joints because they look like they might have served, or do serve, that function.

It's most likely a concrete pool or a gunite that's been painted. How smooth is the surface? Very smooth, or just a bit gritty like a fine sandpaper? Or is there a definite roughness to it? If it's concrete a new coat of paint can do wonders. Ramuc is the only brand I've every used. Have done several Rudd Murray pools (a monolithic poured concrete design) with it and quite a few commercial pools too. It's been the industry standard for quite a few years. A pressure wash or in extreme conditions a water blast (with no abrasives), cleansing wash (degreasing soap), then a TSP (tri sodium phosphate) to neutralize anything, then another rinse is the prep. I prefer the Dawn Blue, although it looks a bit "commercial" sometimes on smaller residential pools.

re: cracks in deck: "Are these diagonal lines/cracks perfectly straight? If so the deck has dropped right at the point it was predicted it would happen after the pouring of the deck. This would have been a different kind of "expansion joint", a relief joint."

The deck probably would have dropped the same distance, but it's appearance would have been a lot less unsightly, with relief joints. If you think of the slab as one monolithic pour, it's the corners that are the weakest if anything is undermined. The larger rectangular sections on either end have the better size shape and mass to resist breaking.

Your explanation concerning the returns makes good sense... I'm gonna call that (tentatively) good news. The procedure for wetting the joints on the supply side makes good sense, too. However it's too late for that, the level is below the skimmer so I can't operate the pump. I'm gonna test the suction line from the skimmer (that's all there is anyway) and if it holds, great, otherwise I'm pretty sure I know where to dig. Any suction pipe from the ground up is going to be replaced when I put in the new pump anyway. I suppose I ought to cut off the suction pipe from the main drain and cap it while I'm at it, since I'm going to abandon it -- maybe I'll test it first and use dye or watch for bubbles to see if those plugs are holding. Does any of that make sense? I guess if I cap it off and abandon it, what difference would it make?

That maindrain line still being plumbed into the suction side of the pump could be the source of the air. If it's plugged at the drain due to leaking then there's no doubt a source of air. When and if you test it you'll be looking for movement in the water with the dye, not necessarily bubbles since the line will be "charged" with water for the testing. If you empty it completely and paint it, you can just look for water escaping. My impression of all main drain that are plugged is that they are faulty. I actually can't remember one that ended up not being so. Remember when you do convert the return line to suction put a fitting on the end for safety. They usually look something like this:

I guess that's about it until I take some pictures. I plan on showing you the "relief" cracks, the hill if I can figure out how to get you a good perspective, the lateral cracks, and of course the fiberglass...
Oh, by the way, in my first conversation with the builder he gave me the impression that this type pool, with the fiberglass side walls, is typical for them. Can't wait to get your "views", after I have sent you something to view. Oh heck, when can you just fly out? A week from Sunday I could take you to a Chiefs game (v. Broncos). Ha. Ha Ha HA. Ha Ha.... Ha Ha Ha Ha Ha Ha...........................

Hey I'd love to, and appreciate the thought, I got the time. Unfortunately because I'm not working right now. Going back to school, gonna start using my head instead of my back. But alas I don't have the dough. Isn't that always the case, when you have the time off you rarely have the money.

[kingbud]

Boy, thanks again for all your insights! This post mainly to let you know that I've sent two messages via "forum" e-mail-- I don't think they are getting through! Need your actual e-mail address so I can send you some pictures...

[Vinyl_Guy]

Boy, thanks again for all your insights! This post mainly to let you know that I've sent two messages via "forum" e-mail-- I don't think they are getting through! Need your actual e-mail address so I can send you some pictures...

Got it, emailing you back details and suggestions.

[kingbud]

Hey Mr. VG -- you still out there? Something interesting turned up when I was tearing everything down this weekend, getting ready for winter: remember our discussion of the plugged main drain? when I took the end off of the ball valve on that line, the line was full into the valve. the skimmer line was full to the same level, both about 4" below the common suction line into the pump. This level was a good 3' above the pool surface where it now is. Care to speculate? btw, got good flow out of the jets when I blew them out, and was able to blow the skimmer line out from the pump end back to the pool. I plan on pressure testing all the lines, but I was a bit surprised to find the skimmer and main drain lines holding water.

The pool builder hasn't made it over yet... but he was complaining about having 3 kids in football, so maybe he can find some time in a couple weeks. Thanks for your interest.