Hydraulics and Circulation - Forum

Hydraulics and Circulation (16)

Open Pit DE Vacuum Filters

Does anyone here have experience with the DE filters with the grids in a pit with an open top? They are vacuum filters, not pressure filters. The facility where I work has these, and I want to learn more, but it seems few people have training/experie

Started by Ben Jewell in Hydraulics and Circulation

1 Reply

Larger or smaller recessed spa jets nozzles?

Hello everyone!

I have a spa "jets" issue that I was hoping to get some help with.

I have a client with a pool/spa combo with a VSP. The jets (7 of them) are on the spa return manifold and are opened by a valve actuator. There is a cut "air" line (2"

Started by Scott Kaiser in Hydraulics and Circulation

1 Reply

In-Floor Cleaning Systems with Solar Pool Heaters

What tips do you have about integrating solar pool heating systems into existing pools with in-floor cleaners? With the high head pressures required by these cleaners, many existing pumps are not capable of the flow rates needed for effective solar p

Started by Jason Szumlanski in Hydraulics and Circulation

2 Replies

Spa water level rises, but how?

Hey gang,

I have a strange one here, hoping you can help. Customer has pool with separate inground spa, with half of the water below grade and half of the water above grade. There is a flagstone cap without coping on the top wall of the spa, which loo

Started by Scott Coffman in Hydraulics and Circulation

8 Replies

plumbing theory

I see a lot of plumbing installations that mention having straight pipe runs of 3x dia of the pipe minimum before the pump. Whilst I understand why that would be for a normal water pump, almost all pool pumps break this theory by making the water tur

Started by John in Hydraulics and Circulation

2 Replies

Check Valves

I am looking for a combination chech valve and flow meter. I have seen called "Flow Viz". Where can I buy one?

Started by Rob Lane in Hydraulics and Circulation

34 Replies

Dolphin water slide plumbing

what is the best way to plumb from a fiberglass pool , would you add a skimmer or add a couple or so fittings to the side wall. slide requires 130 to 150 gpm will use 2" plumbing

Started by CLAYTON MOORE in Hydraulics and Circulation

0 Replies

pump suction problem

since i suspect someone else might have run into this problem, i'm posting it here:

i replaced a pump motor a couple weeks ago (hayward maxflo 1hp) cuz the bearings were squealing. but since then a mysterious problem has persisted: the system won't c

Started by wes spurling in Hydraulics and Circulation

19 Replies

Turnover: Is there any research that verifies the conventional wisdom?

I am doing research for a story and I wonder if anyone can point me to research on turnover? In particular, has any research been done that demonstrates what percentage of a given pool's water actually goes through the filter during "a turnover?"

Nea

Started by Kirstin Pires in Hydraulics and Circulation

50 Replies

Nasa Hydraulic Study

Does anyone have a link to the article that came out within the last couple years detailing the fluid flow of water within a vessel, with and without the drain running?

I don't remember if it was in WaterShapes, or one of the other trade publications

Started by David Penton in Hydraulics and Circulation

8 Replies

Hydraulic Friction loss charts for flexible pvc, or a good multiplier

Having a lot of trouble finding friction loss charts for flexible PVC, anyone have some insight, or the charts?

Started by John Warner in Hydraulics and Circulation

16 Replies

floating a gunite pool

Is it possible for a filled gunite pool to float? I have come across asituation where it appears that a pool (not built by me) has floatedwhile the water was still about 3/4 full. Has anyone had any experiencewith this or have any ideas where to go

Started by Ben Sawatzke in Hydraulics and Circulation

5 Replies

How to stop a constantly clogging impeller.

Hello all,I have a client with a water feature that is constantly getting leaves stuck in the impeller. The water feature has 2 drains plumbed 3", and no skimmer. It has about a 30 foot run to the equipment. At the equipment is a 3/4 HP Max-E-Glas. T

Started by Scott Kaiser in Hydraulics and Circulation

8 Replies

can't isolate a valve!

hi guys,i've got a problem with a paddling pool, and i was wondering if anyone had any better ideas than stripping the pipework/putting in a new valve.basically, the pool has a massive surface area:volume ratio, and the filter screens provided by the

Started by Andrew Latham in Hydraulics and Circulation

8 Replies

Air Vent for VE System....

Hello to All,We have, two VE Pools this Year Already. One Vinyl and One Gunite. The reason for the Discussion is we have Never Used Check Valves on The VE Basin Pump. I was just Woundering The Different ways Orther Companys, have put an Air Vent Syst

Started by Noel Valade in Hydraulics and Circulation

2 Replies

Main Drains - If there is no drain, there can be no hazard.

Here's the history, the logic, and the science - download the case study attachment - then please comment.

Case Study-No Drains Final.doc

Started by Dan Johnson in Hydraulics and Circulation

18 Replies

Pool/Spa Articles

The Journal of the Swimming Pool and Spa Industry - New Volume 6 Now Online

Posted by Que Hales on March 14, 2019 at 9:32pm

The Journal of the Swimming Pool and Spa Industry is coming back! JSPSI, a peer-reviewed technical journal, began in 1995 as a subscription-supported print-based publication. It contained articles at a technical…

Plaster Finishes Should Last 20 Years

Posted by Kim Skinner on February 11, 2019 at 5:07pm

All pool plaster finishes should last 20 years or more. However, some last only 5 to 7 years, and some less than a year before the plaster surface deteriorates, discolors, and looks terrible.

Why the difference? Very often, plaster…

Is Pool Water Balance Always the Problem?

Posted by Kim Skinner on February 6, 2019 at 4:24pm

For 50 years, the pool industry has considered pool water within an LSI of -0.3 and +0.5 to be acceptable and balanced. But recently, and without providing any supporting science or research, the NPC is trying to convince the industry that any…

Are All Color Pigments Good for Pool Plaster

Posted by Kim Skinner on January 17, 2019 at 3:30pm

There are two important issues involved when trying to achieve quality colored pool plaster that will remain durable, attractive, and the proper shade for many years.

The first issue is to utilize superior workmanship practices to achieve…

The Art of Good Pool Plaster Color

Posted by Kim Skinner on January 17, 2019 at 3:25pm

The Art of Good Pool Plaster Color

An attractive plaster color (other than white) is often preferred by pool owners. However, it is very difficult for plasterers to produce a uniform and consistent color. The reality is…

The LSI is Reliable

Posted by Kim Skinner on October 12, 2018 at 3:36pm

Using the Langelier Saturation Index as a guide for maintaining proper pool water balance and to protect pool plaster has become a mainstay in our industry, and we believe, for good reason.

We at onBalance have conducted several LSI…

Aqua Genie

Posted by David Robbins on August 18, 2018 at 7:33am

I have a real old Aqua Genie skimmer with a control valve.

My issue is there is no plumbing schematics detailing how to connect the feed inside the skimmer through the control assembly and into the bottom of the hopper. If anyone knows…

Pool Start-up Alternative for Plaster Pools

Posted by Kim Skinner on July 5, 2018 at 11:15am

Orenda Technologies has recently unveiled a new start-up program that prevents the formation of plaster dust by adding calcium (calcium chloride) to low calcium tap water while filling brand-new plaster pools. We have received communications…

Forum

Hydraulics and Circulation (16)

Open Pit DE Vacuum Filters

Larger or smaller recessed spa jets nozzles?

In-Floor Cleaning Systems with Solar Pool Heaters

Spa water level rises, but how?

plumbing theory

Check Valves

Dolphin water slide plumbing

pump suction problem

Turnover: Is there any research that verifies the conventional wisdom?

Nasa Hydraulic Study

Hydraulic Friction loss charts for flexible pvc, or a good multiplier

floating a gunite pool

How to stop a constantly clogging impeller.

can't isolate a valve!

Air Vent for VE System....

Main Drains - If there is no drain, there can be no hazard.

Note: this page contains paid content.

Pool/Spa Articles

The Journal of the Swimming Pool and Spa Industry - New Volume 6 Now Online

Plaster Finishes Should Last 20 Years

Is Pool Water Balance Always the Problem?

Are All Color Pigments Good for Pool Plaster

The Art of Good Pool Plaster Color

The LSI is Reliable

Aqua Genie

Pool Start-up Alternative for Plaster Pools

Note: this page contains paid content.