Pool dig started Manteca, CA

mas985

TFP Expert
LifeTime Supporter
May 3, 2007
13,857
Pleasanton, CA
Pool Size
20000
Surface
Plaster
Chlorine
Salt Water Generator
According to the manual, you cannot field cut these sheers.


Also, while a rock trap will trap rocks, it isn't likely that you will have large rocks in the lines if the PB is careful during the installation. The real risk is for debris smaller than the pump basket mesh that can get into the return lines. Those types of rain sheers have a finite hole diameter that may or may not be smaller than the pump basket mesh. However, I believe they come with a tool that allows you to clear them if they do clog but I am not sure you would want to rely upon that either.

Here are some posts of people that have had blockage and successfully cleared it:


Adding filters will reduce the risk but not necessarily eliminate the risk as debris can get past when cleaning the filters or when damaged. But since the water is drawn from an MD, it is less likely to get debris in the lines than a skimmer would. It just depends on if you want to take the added risk operating without filters and hoping you can clear any clogs that may occur.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
22,153
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
Main purpose of the rock trap is to keep construction debris left in pipes from clogging up the sheers. The pipes may get mud or rocks or plaster in them when they are laid. You often see chunks of plaster coming out of returns of a new pool. This is all after the filter. This debris can get into the sheers during the pool startup.

Once the pool is operational the pump basket and filter should catch stuff.

See the response from CMP in this thread...

 

Desert Dog

Silver Supporter
Apr 4, 2020
292
Alpine, Ca
Perhaps if it a rain effect, you cannot cut it. I have no experience with those but would imagine the hole cut at an angle would change the effect from hole to hole and thus be an issue. However, If you want the solid curtain of water and get the correct sheer decent you can. As a matter of fact when I ordered mine they asked if it would be installed on a radius and sent me the extra long one so it could be cut to radius. I did it (Owner Builder) and have seen it done by pool builders. Unless we are taking about different products?
 

mihzyd777

Well-known member
Jun 10, 2009
189
Manteca, CA
Pool Size
25000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-40
1)Have not followed the whole thread but if your sheer decent water goes through the filter, I dont thing a rock trap is necessary. I believe those are used if you have a separate pump for water features that do not go through the filter.

2) When you order the sheer decent, you get one with the extra long spout. After it is installed, you carefully cut it to the radius. I and others have used an angler grinder to do this. You could lay the sheer decent upside down on the ledge and trace the curve onto the decent with marker for a nice guide. If the pros are doing it, then they will know what to do.
@Desert Dog Thanks for the reply. Ya we are not going to have the water features go through the filter so that's the reason for the rock traps. The flow would be to high to feed all 3 water features to have it fo through filters.
The pool builder is ordering the sheer rains so I'll let them handle that part. They were on the phone the other day with Pentair to get that ordered correctly as I guess they just give them the radius etc and Pentair cuts it at the factory? Sound familiar? My radius is 2' ft. So can they just order any of those and then cut them?

Thanks!
 

Desert Dog

Silver Supporter
Apr 4, 2020
292
Alpine, Ca
@Desert Dog Thanks for the reply. Ya we are not going to have the water features go through the filter so that's the reason for the rock traps. The flow would be to high to feed all 3 water features to have it fo through filters.
The pool builder is ordering the sheer rains so I'll let them handle that part. They were on the phone the other day with Pentair to get that ordered correctly as I guess they just give them the radius etc and Pentair cuts it at the factory? Sound familiar? My radius is 2' ft. So can they just order any of those and then cut them?

Thanks!
I'm not aware that Pentair offers a cutting service. I was involved with only two sheer decent installs. One on my current home and one on my prior. I only ordered the width I needed and the extra long spout. Then cut the radius needed. It does not look sloppy. Looks factory cut. And the water feature comes with a rock trap. I had it on a raised bond beam with the rear section of the beam visible with a walkway behind it. No room to put a rock trap, but since it goes through the filter, I really did not see the need. I asked or local pool plumbing company about the traps and they say they never use them when the water goes through a filter. I would, in your case install them. I think you would want to cut on sight after installing. Install the feature, tile, then cut it back. That way it does not end up too short or long.