What is the difference between a unit for IG vs AG

[BigDave]

I understand that IG pumps can self-prime and are made to pull water up from below; AG pumps are often designed to be flooded by the water above them. Also there is alot more shenanigans in the HP ratings of AG pumps.

[mas985]

I understand that IG pumps can self-prime and are made to pull water up from below; AG pumps are often designed to be flooded by the water above them. Also there is alot more shenanigans in the HP ratings of AG pumps.

Exactly although technically water can only be pushed and not pulled but that is a minor point.

But AG pumps are generally much smaller than similarly labeled IG pumps so for most situations I would not recommend an IG pump for an AG pool unless it is the smallest in the production line like the 1/2 HP Superpump or the 3/4 HP Superflo or the AG pool is very large. Otherwise, the pump is likely to be over-sized for the filter and pool. Plus you can get a much better deal on an AG combo setup than you would with IG components.

[cinnamon01]

We have an IG about 16000 gal. was just wondering if because it is small if we could get away with an AG set up because of the cost.

[PoolDoc]

SWCG life is a function of cell "ON-time". Our experience here is that most SWCG cells barely last to the end of their warranty, so we recommend over-sizing, rather than under-sizing. The reason is that if your SWCG is 2x the size you need, the ON-time, per pool season will be 1/2 of what it would have otherwise been . . . and the cell will last 2x as long (in years of pool operation, not in hours of cell ON-time).

By going with an AG SWCG, you'll be under-sizing rather than over-sizing, and this will result in premature failure. Most likely, the warranty will have a "cannot be used on IG pools" disclaimer, so you'll have no recourse when failure occurs.

BUT, the AG unit will produce just as much chlorine (while it still works) as it would have installed on an AG pool.

There's one other point to consider: installing an SWCG on an existing pool can result in problems. The increased salt DOES increase corrosion, and your pool may not have been built with that in mind. Some regions have more problem with salt than other, mostly due to dry climates resulting in the salt not being rinsed off by rain. You elected not to include your location, so I can't tell if that applies to you or not.

[CarlD]

We have an IG about 16000 gal. was just wondering if because it is small if we could get away with an AG set up because of the cost.

Here's my view on that: If you are trying to low-ball the cost of an SWCG unit, as opposed to simply smart-shopping to get the best price, you'll save the MOST money by simply using the B-B-B system of pool maintenance.
You'll take 2-5 minutes a day, and once a week 15 minutes (more if you hand vacuum). NO SWCG will save you enough to justify it. Given that, I have one and only installed it in the 11th year of my current pool because I'm away more than I used to be and can leave the pool confidently for 2 weeks or more.

In My Humble Opinion (IMHO).

[mas985]

As to using an AG pump on a IG pool, it is possible but it depends on the installation height of the pump relative to the pool water (above or below and by how much) and/or the pump line. However, there are some AG pumps that self prime such as the Pentair Dynamo and Hayward Power Flo II that would work fine with an IG pool. But most AG pumps require a flooded suction.

Also I would not recommend using an Intex type of SWG and pump combo if that is what you are thinking. They are significantly under powered and definitely require a flooded suction.

[PoolDoc]

FYI: "flooded suction" = the pump is below the level of the pool's surface, and the piping is arranged so water will flow naturally by gravity into the pump.

[cinnamon01]

Sorry I was talking about SWG and as to weather we can use a SWG intended for an AG pool in our IG pool. We have been using SWG but it needs to be replaced and because AG units are less I was just wondering if I can purchase an AG as a replacement. We currently have a Circupool RJ series. Had nothing but problems with it.