What is the water table depth, and how long before the pool pops out
from pressure?... Drain it fast and fill it.
There are ways to relieve the water table pressure (a hole made for a
future drain. Allows the ground water in and plugged for filling the
Many pools sit empty during construction without damage. Think about
portions of Florida, below sea level.
Fiberglass is different I'm, sure.
Best I can tell is my water table is about 385 feet below.
There is not much of Florida that is below sea level, none that I can
think of. You are thinking of New Orleans.
There is a significant pat that is only a few feet above sea level
tho. I am at 11 feet at the finished floor of the house, the pool deck
is about a foot loser
The water table at my house is about 4 feet below the pool deck right
now and the pool is about 8 deep. It will pop out if the water gets
low, pretty much immediately.
When they dig a pool here they have a big mud pump to keep the water
out while they dig.
The first thing that goes into a pool excavation is a couple truck
loads of gravel and a 2" PVC pipe with slits in it as a water pickup
for another big assed pump
When they build the pool they pump the water out when they shoot the
shell. and there are plugs in the bottom of the drain that go into the
gravel under the pool. They let the pool fill with ground water if it
is going to sit a while. When they come back to plaster it they pump
all the water out again. They keep that pump pulling water out from
under the pool until the plastering is done, the plugs are replaced in
the drain pan and the pool has started to fill with the fresh water.
When they decide the pool is full beyond the water table they
disconnect the pump and cap the suction line
Pump and dewater and then put the fiberglass pool in quick with the
crane and start filling it before ground water can start building
pressure. You could if you were particularly nuts, drill a shallow well
adjacent to and 5-10' deeper than the pool and run a pump in it for a
few days to lower the water table in the area at which point you could
drain the pool. Ground water is interesting in the way it follows
He needs to get a cyanuric acid tester to see the level of his stabilizer.
Stabilizer will reduce the amount of chlorine that evaporates. Sounds like
the algae problem is related to times when the chlorine gasses off, and then
the algae grows. Algae can't grow in properly chlorinated water. It's been
proven. I would start there. On my pool, I check the stabilizer every
year, and remarkably, it is about the same. I don't back flush a lot, but
do have incredible buildup of minerals from hard water. At times, I will
put an inflow and outflow and "flush" some of the water.
I'd give you a blank stare, too, if you came into my shop and put out your
idea. You obviously are well intentioned but not knowledgeable about how it
Quit overthinking this. Go get a stabilizer kit and test kit. Get the
water right by changing some if you have to or adding additives. Then get
the stabilizer level right. Then go swimming. It isn't rocket surgery.
Re Re: Changing *all* the pool water without lowering the water level:
One other point however.
When you have almost completely drained the old water and have the new
water sitting on top of the old water and separated by the plastic;
will you be able to pull the plastic sheet out? At this point the new
water should be pushing the plastic against the sides of the pool
quite firmly. I would guess that you will have to cut the plastic into
strips to get it out.
Wrong, the water (and algae slime) remaining under the plastic is a very
good "bearing" and two people pulling the plastic / tarp from one side
should have no problem at all removing it. If the plastic was placed
with the pool fully dry and then water was added on top it would be
YADA YADA YADA
The simplest way to change the water and the industry standard is to
replace the water with water proof bricks ,bricks must be sealed, Thompsons
is good, 2" disposable brush. The bricks will displace the water once the
pool is full of bricks start refilling the pool and removing the bricks at
the same time kind of a balancing act. You must realize you will only get
at best 85% of water out. but that would be enough to get you stabilizer
level down. In reality "your friend needs to find another pool supply store
to deal with and learn how to take care of a pool correctly.
Actually, test kits to test stabilizer level are commonly
Your friend probably already knows the right routine:
Get the chemical levels right, then use liquid chlorine shock
to wipe out the algae.
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