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"If the suction is 10.2 feet and the pressure is 23 feet of head, the total is about 33.2 feet and the flow is about 105 GPM." Pressure is 14 psi x 2.3 ft of head/psi = 32 feet of head and the suction is 10.2 feet of head, total is 42 ft and flow is 90 gpm I'm using the pressure at the pump...

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15 cents per kWh — not cost effective to replace if not broken.

Cartridges are the same as the ones shown in response #37 above. I thought that the pressures should be the same also but there are factors that can cause them to different, such as the differences in elevation of the gauges, the flow in the tank and the piping causing friction losses, and...

I mentioned the pump issue with the PB but he does not want to replace it. I don’t think it’s illegal for him to not replace it, even though the pool has yet to pass final inspection and is still under construction. What else can I do? Why is it that turnover is not important in residential...

The pressure is 14 psi at the pump but drops to 11 psi at the hose connection and to 4 psi at the top of the filtration tank.

Update: recalculation shows 42.5 feet TDH, which corresponds to 90 gpm on the pump curve. An increase in 10 psi due to dirty filter would correspond to 40 gpm on the pump curve. So, as the filter gets dirtier, the flow decreases from 90 to 40 gpm at 10 psi increase in the pump discharge...

I measured the delta p across the pump using vacuum/pressure gauge. It’s approximately 24 psi, which corresponds to a fIow rate of 40 gpm. This would take 8 hrs to recirculate the pool.

Good news! A strong magnet did not stick so rebar is not exposed. Bad news is I still don't know how to remove the stain.

There's a line of brown stains that I've been trying to remove. It looks like rust (see pic above). I tried muriatic acid, chlorine puck, and vitamin c tablet without success. Any ideas? I'm thinking it might be rusted steel (rebar) coming though plaster.

Can you recommend a decent vacuum gauge for this pump? I need to determine the flow rate and a delta p across the pump will allow me to do this.

The pipes are connected correctly to the filter tank. As shown in the pic, the pump discharge is connected to the lower part of the tank. The pipe connected to the upper part of the tank goes to the return lines to the pool.

If you are referring to the filter cartridge, no. The cartridge does not have a top or a bottom. Water pass through the cartridge from the outer to the inner area of the tank and out the upper area. Which filter part are you referring to?

Check valve is installed correctly. No picture of the split joint but there is one of the 1" return penetrating the pool wall during construction. See pic below. I may suggest to the PB about checking inside the suction valves and putting a vacuum gauge on the pump. So far they did a leak test...

You can see the words in this pic below.