Check Valves on Chorinator

by Kathleen
(PA)

Why do you need to have a check valve after the chlorinator? When the pump isn't running the water inside the pool maintains equal pressure on both sides of the pump and filter, so the water is not flowing.

I don't see how water can back feed into the filter.



Hi Kathleen. I'm not sure how, or why, it does but it does. Whether the water moves or whether it's just the fumes that move through the water, I’m not sure. I do know the damage that can be caused by chlorinators and I would sure have a check valve.

Hi concentrations of chlorine can easily damage a vinyl liner. I have seen this happen when the return flow was set to hit the edge of the pool as opposed to going out away from the pool wall. I have also seen liners damaged by leaky returns where high concentrations of chlorine seeped around the edges of the return and came in contact with the liner.

For many years we set up chlorinators for a store we worked for. We plumbed all the filters with flexible PVC pipe. This pipe normally lasts just about forever. We found that the short piece of pipe used between the chlorinator and the check valve would only last a few years before it was eaten up from the inside out.

Seeing what this amount of chlorine could do to PVC pipe made me a believer in check valves and helped me to understand why this water should not be allowed back into the filter.

The valves we installed were between the filter and the chlorinator. I believe this is the proper place to install them.

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Ground Wire on an Above Ground Pool

by Brian
(Massachusetts)

Where and how do I attach the ground wire to a pool that has resin post and joints? Pool is 18 round. Please help!!



Hi Brian. That is a good question. Many times the pool bottom rails are steel, you could drive a Tek screw into the rail holding your ground wire. The footplates are usually metal and a wire could easily be bolted to one of them, even if you needed to remove a few screws and pull the bottom of the upright away from the pool.

When all else fails go to the wall joint and loosen one of the nuts, attach your wire, or wire connector, and re-tighten the nut. This can usually be done without removing the upright, but if you can not get behind it, remove the bottom screws to make it easier.

Those are all the secrets to ground wires on above ground pools that I know of.

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Do I Have a Salt Water Pool

Hi, I just bought a house and it was vacant for a couple of months. I wanted to test my pool and see if it needed more chlorine but the chlorine part of the test, the water should turn yellow and it was completely clear.

How can I find out my pool needs chlorine or salt water?



Hi. You are correct, a pool low on chlorine or one low on salt would show the same in a water test.

Take a close look at your pool equipment. A salt water system should be well labeled as such.

Most above ground pools will have a skimmer going to a pool pump. The pump goes to the filter and the filter goes directly back into the pool.

If there is something connected to the line going back into the pool take a look at it. It might be a chlorinator or it could be a salt water system.

If it is a chlorinator it probably just needs to be refilled. If it is a salt water system it should have a computer type read out telling you what it needs.

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