i recently had my pool completely redone. it's a small pool, about 13k, with a spa. i got a 2 speed 2hp hayward with the intention of always using the low for the pool and the high for the spa.
while i rarely use the pump on high for the pool, i occasionally flip it on for some quick skimming action if i need it.
for the most part, the plumbing is per the hayward site, 2.5/2.0, but i noticed that the pipe is necked down to 2.0" at the connection to the pump inlet and at the skimmer. is this a fairly common practice? i realize that the long runs of 2.5 are still of benefit, i'm just how detrimental (if at all) the reducing is.
i kindof started looking into this after i noticed tiny bubbles occasionally and started searching. one item i saw was the skimmer, (pentair admiral s20) that only has 2" port and a sticker that says max 60 gpm... it also has an equalizer valve that diverts water from the mains, which looks incredibly restrictive...
anyway, for now i'm trying to rule out cavitation, though i'm pretty certain that even at 2" pipe, i shouldn't be getting any cavitation bubbles at low speed. which i seem to be getting at about 6 hours into my 8 hour filter cycle...
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thanks for looking