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You can make an estimate based on how much your hot tub temp drops in a given time, which is directly related to the insulation of your hot tub and cover. It takes about 2.44 watt-hrs to heat 1 gallon of water 1 degree F. As soon as your heater shuts off for a cycle, turn it completely off and...

Currently, my overflow spa has two small manual valves next to the spa that you can unscrew to allow air to mix. I had the option of adding a blower, but friends never use theirs as it is too powerful and cools the water quickly. However, when the system was plumbed, the air line was capped...

Thanks for the explanation. I agree with you. Its looking good that the check valve is to blame. ED - what have you tried so far from all the suggestions you've gotten?

Spring check valves restrict flow a lot more than swing check vavles. My favorite check valve for pool use is the one you have in the spa return. It is clear so you can see it, swing type, and you can change the spring and flapper without having to remove the body - so no cutting and glueing...

Yes, but does the OP know what their "normal" pressure was? What is your thinking mas985? None of this has changed since the problem started. If this were a new pool and he never had good flow, I'd understand. From the pics it looks like 2 inch pipe at least. ED - is that a swing check...

Good summary. I think you can easily get caught up chasing too many things and end up making mistakes - like cutting lines and replumbing. Have you removed the jets? Since you only installed them AFTER you noticed the reduced flow, just get them out of the equation for now. a. This is the...

Your pipes have the hanger shape thing at the end to keep debris from getting in, wasps from building nests, etc. The length of those pipes will not affect the venturi significantly, if at all. You could remove the caps at the ends to check for clogs and just for a test, let the pipes have no...

I'm sticking to my theory that the two check valves (one right after the filter and one below ground) are the culprits. I think they have lowered the flow too much. If you consider you noticed this only after they were added, and the very low probability of a bad valve or clogged pipe, then...

Thanks for the pics... the only thing I don't like is the check valve they used after the filter. I prefer the type that you have on the spa return line. I'm not sure, but the type that I see in the pic does look like it could restrict flow somewhat. Someone else asked and it is a good...

OK. I think I understand now. The nozzles will not help if the GPMs are not there. Go ahead and take them out for now while you troubleshoot because your only known situation of good flow was without them. Do you normally have some flow diverted to the spa so that it waterfalls into the...

Just to clarify.... At first you had no nozzles, but were getting good flow and bubbles. Then you added the 1/2" opening nozzles and not much changed - you still got good flow and bubbles. Then at some point the flow slowed down and no bubbles - correct? Also - at some you suspected the...

Your solar heater could be hooked up wrong. Are you sure it can be isolated? Can you send us photos of your equipment pad and valves. If that is the only thing different, then that is the first place to check. I don't mean to insult your intelligence, but are you sure the spa nozzles are...

If you forget to shut off the pool returns, you will know quickly because the water level in the spa will start to drop. And if you are not paying attention, the pump will run dry when the spa is all drained. Unless your spa really is lower than the pool, but I'm thinking you meant to say the...

JoshU, Thanks for the additional comments on my post. You are right, a solar cover can save you tons of money. Most of the people I know who have them don't use them. I know because I've been offered lost of blankets and reels from people who want to get them out of their garage. I find...

Here is central - southern Florida, most people use heat pumps. They are essentially A/C units operating in reverse. They don't work well in cold climates like the norhtern US. They have high initial costs, are large, and will last you about as long as a typical central A/C unit 10-15 years...

thermal overload of the blower? Something is causing the blower to overheat and it has built in thermal protection so won't restart until it cools down.

If you switch the units in the pool calculator to English up at the top, it then tells you how many oz by weigh and volume. Hover the mouse pointer over the oz reading and just below it will show it converted into lbs and cups respectively.

http://en.wikipedia.org/wiki/Venturi_effect